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$308.99 $76.03
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Apr
Jul
Oct
Jan
Apr
Jul
Oct
Jan
Apr
2014
2015
2016
$279.32, Jan 10 - Jan 27 $284.99, Jan 27 - Mar 3 $276.53, Mar 4 - Jun 10 $276.53, Mar 4 - Jun 10 $215.94, May 2 - May 8 $170.00, May 2 - May 23 $276.53, Mar 4 - Jun 10 $212.33, May 9 - May 11 $170.00, May 2 - May 23 $276.53, Mar 4 - Jun 10 $212.32, May 12 11:18 am $170.00, May 2 - May 23 $276.53, Mar 4 - Jun 10 $208.07, May 13 - May 14 $170.00, May 2 - May 23 $276.53, Mar 4 - Jun 10 $203.91, May 16 - May 22 $170.00, May 2 - May 23 $276.53, Mar 4 - Jun 10 $199.83, May 22 - May 26 $170.00, May 2 - May 23 $276.53, Mar 4 - Jun 10 $199.83, May 22 - May 26 $169.99, May 24 - May 26 $276.53, Mar 4 - Jun 10 $195.82, May 27 - May 29 $168.00, May 27 - Jun 16 $276.53, Mar 4 - Jun 10 $192.82, May 30 - Jul 25 $168.00, May 27 - Jun 16 $276.51, Jun 11 - Jun 29 $192.82, May 30 - Jul 25 $168.00, May 27 - Jun 16 $276.51, Jun 11 - Jun 29 $192.82, May 30 - Jul 25 $173.54, Jun 17 1:25 am $276.51, Jun 11 - Jun 29 $192.82, May 30 - Jul 25 $173.53, Jun 18 - Jun 19 $276.51, Jun 11 - Jun 29 $192.82, May 30 - Jul 25 $173.51, Jun 20 - Jun 23 $276.51, Jun 11 - Jun 29 $192.82, May 30 - Jul 25 $173.50, Jun 24 - Jun 25 $276.51, Jun 11 - Jun 29 $192.82, May 30 - Jul 25 $169.20, Jun 27 - Jun 29 $221.21, Jun 30 - Jul 20 $192.82, May 30 - Jul 25 $169.19, Jun 30 4:14 am $221.21, Jun 30 - Jul 20 $192.82, May 30 - Jul 25 $173.54, Jul 2 - Jul 21 $276.51, Jul 21 - Jul 30 $192.82, May 30 - Jul 25 $173.54, Jul 2 - Jul 21 $276.51, Jul 21 - Jul 30 $192.82, May 30 - Jul 25 $164.86, Jul 25 10:23 am $276.51, Jul 21 - Jul 30 $192.81, Jul 26 - Aug 4 $159.95, Jul 26 - Aug 2 $273.73, Jul 31 - Aug 10 $192.81, Jul 26 - Aug 4 $159.95, Jul 26 - Aug 2 $273.73, Jul 31 - Aug 10 $192.81, Jul 26 - Aug 4 $164.85, Aug 3 - Aug 4 $273.73, Jul 31 - Aug 10 $173.53, Aug 5 - Sep 17 $140.56, Aug 5 - Aug 7 $273.73, Jul 31 - Aug 10 $173.53, Aug 5 - Sep 17 $148.37, Aug 8 - Aug 12 $270.98, Aug 11 - Aug 22 $173.53, Aug 5 - Sep 17 $148.37, Aug 8 - Aug 12 $270.98, Aug 11 - Aug 22 $173.53, Aug 5 - Sep 17 $140.95, Aug 13 - Aug 14 $270.98, Aug 11 - Aug 22 $173.53, Aug 5 - Sep 17 $148.37, Aug 15 - Sep 5 $268.26, Aug 23 - Aug 29 $173.53, Aug 5 - Sep 17 $148.37, Aug 15 - Sep 5 $265.57, Aug 30 - Sep 5 $173.53, Aug 5 - Sep 17 $148.37, Aug 15 - Sep 5 $262.91, Sep 7 - Sep 14 $173.53, Aug 5 - Sep 17 $140.56, Sep 7 - Sep 10 $262.91, Sep 7 - Sep 14 $173.53, Aug 5 - Sep 17 $164.85, Sep 12 - Sep 17 $260.29, Sep 16 - Sep 22 $173.53, Aug 5 - Sep 17 $164.85, Sep 12 - Sep 17 $260.29, Sep 16 - Sep 22 $183.18, Sep 19 12:08 pm $174.01, Sep 19 12:08 pm $260.29, Sep 16 - Sep 22 $173.53, Sep 22 - Sep 24 $156.61, Sep 22 - Sep 24 $260.20, Sep 24 - Nov 26 $173.53, Sep 22 - Sep 24 $156.61, Sep 22 - Sep 24 $260.20, Sep 24 - Nov 26 $192.82, Sep 26 7:03 am $183.18, Sep 26 7:03 am $260.20, Sep 24 - Nov 26 $229.88, Sep 28 7:55 am $219.48, Sep 28 7:55 am $260.20, Sep 24 - Nov 26 $229.84, Sep 30 8:15 am $224.88, Sep 30 8:15 am $260.20, Sep 24 - Nov 26 $223.03, Oct 2 11:01 am $223.03, Oct 2 11:01 am $260.20, Sep 24 - Nov 26 $224.90, Oct 4 2:30 pm $224.56, Oct 4 2:30 pm $260.20, Sep 24 - Nov 26 $224.76, Oct 6 4:26 pm $224.74, Oct 6 4:26 pm $260.20, Sep 24 - Nov 26 $223.03, Oct 8 - Oct 29 $218.59, Oct 8 - Oct 15 $260.20, Sep 24 - Nov 26 $223.03, Oct 8 - Oct 29 $218.58, Oct 17 7:00 am $260.20, Sep 24 - Nov 26 $223.03, Oct 8 - Oct 29 $218.59, Oct 19 10:57 am $260.20, Sep 24 - Nov 26 $223.04, Oct 21 - Oct 23 $223.03, Oct 8 - Oct 29 $260.20, Sep 24 - Nov 26 $223.05, Oct 29 6:43 pm $223.03, Oct 8 - Oct 29 $260.20, Sep 24 - Nov 26 $226.82, Nov 1 1:20 pm $129.99, Nov 1 1:20 pm $260.20, Sep 24 - Nov 26 $217.72, Nov 8 9:28 am $163.23, Nov 8 9:28 am $260.20, Sep 24 - Nov 26 $208.98, Nov 13 6:46 pm $156.51, Nov 13 - Nov 17 $260.20, Sep 24 - Nov 26 $208.86, Nov 17 1:54 pm $156.51, Nov 13 - Nov 17 $260.20, Sep 24 - Nov 26 $208.79, Nov 20 3:24 am $148.68, Nov 20 3:24 am $260.20, Sep 24 - Nov 26 $227.35, Nov 22 5:52 am $129.17, Nov 22 - Dec 2 $260.20, Sep 24 - Nov 26 $227.34, Nov 24 - Nov 28 $129.17, Nov 22 - Dec 2 $233.94, Nov 28 - Dec 5 $164.94, Nov 30 1:20 am $129.17, Nov 22 - Dec 2 $233.94, Nov 28 - Dec 5 $223.94, Dec 2 2:32 am $129.17, Nov 22 - Dec 2 $233.94, Nov 28 - Dec 5 $223.88, Dec 4 12:44 am $128.52, Dec 4 - Dec 9 $233.94, Nov 28 - Dec 5 $223.94, Dec 5 10:48 pm $128.52, Dec 4 - Dec 9 $293.54, Dec 7 - Feb 20 $232.63, Dec 7 9:40 pm $128.52, Dec 4 - Dec 9 $293.54, Dec 7 - Feb 20 $232.57, Dec 9 10:57 pm $128.52, Dec 4 - Dec 9 $293.54, Dec 7 - Feb 20 $212.27, Dec 11 11:53 pm $152.85, Dec 11 11:53 pm $293.54, Dec 7 - Feb 20 $212.21, Dec 13 11:28 pm $145.21, Dec 13 - Dec 15 $293.54, Dec 7 - Feb 20 $212.15, Dec 15 11:49 pm $145.21, Dec 13 - Dec 15 $293.54, Dec 7 - Feb 20 $212.08, Dec 17 10:05 pm $137.94, Dec 17 10:05 pm $293.54, Dec 7 - Feb 20 $229.50, Dec 23 12:56 pm $124.44, Dec 22 - Dec 28 $293.54, Dec 7 - Feb 20 $225.41, Dec 25 11:00 am $124.44, Dec 22 - Dec 28 $293.54, Dec 7 - Feb 20 $224.95, Dec 26 11:45 am $124.44, Dec 22 - Dec 28 $293.54, Dec 7 - Feb 20 $224.21, Dec 28 4:02 pm $124.44, Dec 22 - Dec 28 $293.54, Dec 7 - Feb 20 $223.42, Dec 31 8:55 am $98.40, Dec 31 8:55 am $293.54, Dec 7 - Feb 20 $219.26, Jan 3 12:53 am $93.38, Jan 3 12:53 am $293.54, Dec 7 - Feb 20 $217.91, Jan 4 9:53 am $93.32, Jan 4 9:53 am $293.54, Dec 7 - Feb 20 $216.64, Jan 6 11:35 am $93.22, Jan 6 11:35 am $293.54, Dec 7 - Feb 20 $216.01, Jan 8 5:13 pm $88.72, Jan 8 5:13 pm $293.54, Dec 7 - Feb 20 $215.42, Jan 10 9:21 pm $88.60, Jan 10 9:21 pm $293.54, Dec 7 - Feb 20 $214.76, Jan 13 4:58 pm $88.44, Jan 13 4:58 pm $293.54, Dec 7 - Feb 20 $213.94, Jan 15 8:59 am $84.34, Jan 15 8:59 am $293.54, Dec 7 - Feb 20 $210.44, Jan 17 12:43 am $76.12, Jan 17 12:43 am $293.54, Dec 7 - Feb 20 $206.85, Jan 18 4:40 pm $76.03, Jan 18 4:40 pm $293.54, Dec 7 - Feb 20 $201.74, Jan 22 1:19 am $76.16, Jan 20 - Jan 22 $293.54, Dec 7 - Feb 20 $206.20, Jan 23 - Jan 28 $86.59, Jan 23 - Jan 27 $293.54, Dec 7 - Feb 20 $206.18, Jan 30 1:55 pm $117.35, Jan 30 - Jan 31 $293.54, Dec 7 - Feb 20 $206.08, Jan 31 11:52 am $117.35, Jan 30 - Jan 31 $293.54, Dec 7 - Feb 20 $206.20, Feb 2 - Feb 9 $99.75, Feb 2 - Feb 4 $293.54, Dec 7 - Feb 20 $206.20, Feb 2 - Feb 9 $130.98, Feb 5 - Feb 9 $293.54, Dec 7 - Feb 20 $204.50, Feb 11 - Feb 13 $130.91, Feb 11 6:23 am $293.54, Dec 7 - Feb 20 $204.50, Feb 11 - Feb 13 $176.85, Feb 13 - Feb 16 $293.54, Dec 7 - Feb 20 $200.00, Feb 14 - Mar 25 $176.85, Feb 13 - Feb 16 $293.54, Dec 7 - Feb 20 $200.00, Feb 14 - Mar 25 $184.85, Feb 18 6:06 pm $293.54, Dec 7 - Feb 20 $200.00, Feb 14 - Mar 25 $181.99, Feb 20 - Feb 24 $289.56, Feb 22 1:35 pm $200.00, Feb 14 - Mar 25 $181.99, Feb 20 - Feb 24 $289.84, Feb 24 - Mar 8 $200.00, Feb 14 - Mar 25 $181.99, Feb 20 - Feb 24 $289.84, Feb 24 - Mar 8 $200.00, Feb 14 - Mar 25 $170.16, Feb 26 - Mar 15 $286.80, Mar 11 - Mar 15 $200.00, Feb 14 - Mar 25 $170.16, Feb 26 - Mar 15 $293.54, Mar 18 5:47 am $200.00, Feb 14 - Mar 25 $168.46, Mar 18 5:47 am $308.99, Mar 20 - Apr 25 $200.00, Feb 14 - Mar 25 $166.76, Mar 20 1:51 pm $308.99, Mar 20 - Apr 25 $200.00, Feb 14 - Mar 25 $165.10, Mar 22 11:01 pm $308.99, Mar 20 - Apr 25 $200.00, Feb 14 - Mar 25 $152.49, Mar 25 5:38 am $308.99, Mar 20 - Apr 25 $238.91, Mar 27 12:38 pm $151.88, Mar 27 - Mar 29 $308.99, Mar 20 - Apr 25 $238.79, Mar 29 - Mar 31 $149.45, Mar 31 - Apr 5 $308.99, Mar 20 - Apr 25 $237.99, Apr 2 4:24 pm $149.45, Mar 31 - Apr 5 $308.99, Mar 20 - Apr 25 $237.71, Apr 5 7:00 am $149.45, Mar 31 - Apr 5 $308.99, Mar 20 - Apr 25 $237.51, Apr 7 10:49 pm $149.41, Apr 7 10:49 pm $308.99, Mar 20 - Apr 25 $232.45, Apr 10 3:17 pm $149.38, Apr 10 3:17 pm $308.99, Mar 20 - Apr 25 $233.74, Apr 12 3:00 am $149.41, Apr 12 3:00 am $308.99, Mar 20 - Apr 25 $240.17, Apr 14 - Apr 25 $161.48, Apr 14 6:11 pm $308.99, Mar 20 - Apr 25 $240.17, Apr 14 - Apr 25 $161.53, Apr 17 - Apr 20 $308.99, Mar 20 - Apr 25 $240.17, Apr 14 - Apr 25 $160.72, Apr 22 5:57 pm $308.99, Apr 28 - Aug 10 $240.17, Apr 28 - May 1 $228.15, Apr 28 - May 4 $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $228.15, Apr 28 - May 4 $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $235.73, May 6 7:40 pm $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $235.69, May 10 10:06 pm $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $231.98, May 14 4:59 am $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $235.24, May 18 3:02 am $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $234.99, May 22 10:05 am $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $224.98, May 26 2:50 pm $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $229.29, May 31 4:07 am $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $185.69, Jun 4 6:28 pm $308.99, Apr 28 - Aug 10 $238.14, May 4 - Jun 9 $185.71, Jun 9 2:46 am $308.99, Apr 28 - Aug 10 $237.37, Jun 13 - Jun 28 $185.00, Jun 13 2:42 am $308.99, Apr 28 - Aug 10 $237.37, Jun 13 - Jun 28 $184.99, Jun 16 8:06 pm $308.99, Apr 28 - Aug 10 $237.37, Jun 13 - Jun 28 $188.99, Jun 20 3:42 pm $308.99, Apr 28 - Aug 10 $237.37, Jun 13 - Jun 28 $170.09, Jun 24 10:25 am $308.99, Apr 28 - Aug 10 $237.37, Jun 13 - Jun 28 $175.98, Jun 28 12:52 pm $308.99, Apr 28 - Aug 10 $237.23, Jul 2 - Jul 19 $187.08, Jul 2 4:09 pm $308.99, Apr 28 - Aug 10 $237.23, Jul 2 - Jul 19 $184.99, Jul 6 - Jul 12 $308.99, Apr 28 - Aug 10 $237.23, Jul 2 - Jul 19 $184.93, Jul 16 4:17 am $308.99, Apr 28 - Aug 10 $237.23, Jul 2 - Jul 19 $184.74, Jul 19 6:16 pm $308.99, Apr 28 - Aug 10 $236.84, Jul 23 8:07 am $189.00, Jul 23 8:07 am $308.99, Apr 28 - Aug 10 $241.35, Jul 26 - Aug 6 $185.00, Jul 26 10:07 pm $308.99, Apr 28 - Aug 10 $241.35, Jul 26 - Aug 6 $160.00, Jul 30 - Aug 10 $308.99, Apr 28 - Aug 10 $240.48, Aug 10 - Aug 18 $160.00, Jul 30 - Aug 10 $268.69, Aug 14 - Sep 13 $240.48, Aug 10 - Aug 18 $158.08, Aug 14 9:17 am $268.69, Aug 14 - Sep 13 $240.48, Aug 10 - Aug 18 $146.15, Aug 18 2:59 am $268.69, Aug 14 - Sep 13 $239.54, Aug 21 9:28 pm $135.35, Aug 21 9:28 pm $268.69, Aug 14 - Sep 13 $236.11, Aug 25 3:48 pm $135.30, Aug 25 3:48 pm $268.69, Aug 14 - Sep 13 $235.32, Aug 29 10:09 am $127.15, Aug 29 10:09 am $268.69, Aug 14 - Sep 13 $238.48, Sep 2 3:33 am $124.15, Sep 2 3:33 am $268.69, Aug 14 - Sep 13 $238.22, Sep 6 1:19 am $124.05, Sep 6 1:19 am $268.69, Aug 14 - Sep 13 $237.18, Sep 9 11:31 pm $123.95, Sep 9 11:31 pm $268.69, Aug 14 - Sep 13 $236.34, Sep 13 7:59 pm $123.90, Sep 13 7:59 pm $274.66, Sep 17 - Sep 21 $236.80, Sep 17 - Sep 21 $115.55, Sep 17 - Sep 21 $308.99, Sep 25 - Mar 27 $239.98, Sep 25 12:46 pm $104.85, Sep 25 - Sep 29 $308.99, Sep 25 - Mar 27 $237.10, Sep 29 10:43 am $104.85, Sep 25 - Sep 29 $308.99, Sep 25 - Mar 27 $231.58, Oct 3 12:15 pm $104.84, Oct 3 - Oct 7 $308.99, Sep 25 - Mar 27 $225.84, Oct 7 2:52 pm $104.84, Oct 3 - Oct 7 $308.99, Sep 25 - Mar 27 $221.62, Oct 11 5:16 pm $101.58, Oct 11 5:16 pm $308.99, Sep 25 - Mar 27 $216.10, Oct 15 3:50 pm $94.48, Oct 15 3:50 pm $308.99, Sep 25 - Mar 27 $211.14, Oct 19 12:09 pm $94.43, Oct 19 12:09 pm $308.99, Sep 25 - Mar 27 $207.50, Oct 23 9:25 am $94.40, Oct 23 9:25 am $308.99, Sep 25 - Mar 27 $210.08, Oct 27 6:59 am $94.36, Oct 27 6:59 am $308.99, Sep 25 - Mar 27 $176.63, Oct 31 6:25 am $89.99, Oct 31 - Nov 21 $308.99, Sep 25 - Mar 27 $192.33, Nov 4 6:25 am $89.99, Oct 31 - Nov 21 $308.99, Sep 25 - Mar 27 $205.00, Nov 8 8:59 am $89.99, Oct 31 - Nov 21 $308.99, Sep 25 - Mar 27 $208.15, Nov 12 11:50 am $89.99, Oct 31 - Nov 21 $308.99, Sep 25 - Mar 27 $241.32, Nov 16 6:28 pm $89.99, Oct 31 - Nov 21 $308.99, Sep 25 - Mar 27 $226.76, Nov 21 3:14 am $89.99, Oct 31 - Nov 21 $308.99, Sep 25 - Mar 27 $207.56, Nov 25 1:26 pm $121.50, Nov 25 - Nov 30 $308.99, Sep 25 - Mar 27 $192.80, Nov 30 6:50 am $121.50, Nov 25 - Nov 30 $308.99, Sep 25 - Mar 27 $184.99, Dec 5 - Dec 10 $114.75, Dec 5 4:34 am $308.99, Sep 25 - Mar 27 $184.99, Dec 5 - Dec 10 $114.74, Dec 10 7:11 am $308.99, Sep 25 - Mar 27 $177.74, Dec 12 9:00 pm $114.73, Dec 12 9:00 pm $308.99, Sep 25 - Mar 27 $184.99, Dec 17 9:54 pm $114.75, Dec 17 9:54 pm $308.99, Sep 25 - Mar 27 $184.38, Dec 22 8:09 pm $128.65, Dec 22 8:09 pm $308.99, Sep 25 - Mar 27 $170.37, Dec 28 5:29 am $114.75, Dec 28 - Jan 1 $308.99, Sep 25 - Mar 27 $169.70, Jan 1 9:44 pm $114.75, Dec 28 - Jan 1 $308.99, Sep 25 - Mar 27 $169.01, Jan 6 5:57 pm $128.65, Jan 6 5:57 pm $308.99, Sep 25 - Mar 27 $168.34, Jan 11 3:03 pm $129.99, Jan 11 - Jan 16 $308.99, Sep 25 - Mar 27 $167.64, Jan 16 1:48 pm $129.99, Jan 11 - Jan 16 $308.99, Sep 25 - Mar 27 $166.93, Jan 21 2:18 pm $126.89, Jan 21 2:18 pm $308.99, Sep 25 - Mar 27 $166.27, Jan 26 3:37 pm $127.31, Jan 26 3:37 pm $308.99, Sep 25 - Mar 27 $165.58, Jan 31 2:18 pm $123.98, Jan 31 2:18 pm $308.99, Sep 25 - Mar 27 $164.84, Feb 5 6:17 pm $129.34, Feb 5 6:17 pm $308.99, Sep 25 - Mar 27 $160.80, Feb 10 7:38 pm $145.00, Feb 10 7:38 pm $308.99, Sep 25 - Mar 27 $160.01, Feb 16 4:24 am $144.75, Feb 16 4:24 am $308.99, Sep 25 - Mar 27 $159.23, Feb 21 5:20 pm $143.50, Feb 21 5:20 pm $308.99, Sep 25 - Mar 27 $158.47, Feb 27 2:49 am $158.47, Feb 27 2:49 am $308.99, Sep 25 - Mar 27 $169.05, Mar 9 - Mar 21 $133.15, Mar 9 2:52 pm $308.99, Sep 25 - Mar 27 $169.05, Mar 9 - Mar 21 $144.68, Mar 21 - Mar 27 $308.99, Sep 25 - Mar 27 $169.06, Mar 27 6:43 am $144.68, Mar 21 - Mar 27
61,371 1,714,515
1,953,125
1,562,500
1,171,875
781,250
390,625
Oct
Dec
Feb
Apr
Jun
Aug
Oct
Dec
Feb
Apr
2015
2016
Price Details
New
Last Seen
$308.99 Mar 27, '16
Highest
$308.99 Sep 25, '15
Lowest
$221.21 Jun 30, '14
Average
$308.99 (30d avg) $308.99 (90d avg) $308.99 (180d avg) $304.46 (365d avg) $288.04 (Lifetime average)
Added
Jan 10, 2014
3rd Party New
Last Seen
$169.06 Mar 27, '16
Highest
$241.35 Jul 26, '15
Lowest
$158.47 Feb 27, '16
Average
$164.87 (30d avg) $165.06 (90d avg) $185.37 (180d avg) $212.11 (365d avg) $207.42 (Lifetime average)
Added
Jan 10, 2014
3rd Party Used
Last Seen
$144.68 Mar 27, '16
Highest
$235.73 May 6, '15
Lowest
$76.03 Jan 18, '15
Average
$145.50 (30d avg) $135.24 (90d avg) $119.55 (180d avg) $147.04 (365d avg) $151.99 (Lifetime average)
Added
Jan 10, 2014
Sales Rank
30 day average: 864,945 90 day average: 996,153
Product Description
This edition includes more information on gene-environment interactions. The section on air pollution has been completely reorganized. Other Fourth Edition highlights include expanded coverage of government responses to the field and a new chapter on children's environmental health.
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