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$20.45 $0.01
$22.50
$18.00
$13.50
$9.00
$4.50
Sep
Nov
Jan
Mar
May
Jul
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Nov
Jan
Mar
May
2015
2016
$18.51, Jul 30 - Aug 14 $10.98, Jul 30 - Aug 16 $0.50, Jul 30 - Aug 5 $18.51, Jul 30 - Aug 14 $10.98, Jul 30 - Aug 16 $0.44, Aug 7 2:46 pm $18.51, Jul 30 - Aug 14 $10.98, Jul 30 - Aug 16 $0.49, Aug 8 4:25 pm $18.51, Jul 30 - Aug 14 $10.98, Jul 30 - Aug 16 $0.43, Aug 10 4:41 pm $18.51, Jul 30 - Aug 14 $10.98, Jul 30 - Aug 16 $0.39, Aug 12 2:19 pm $18.51, Jul 30 - Aug 14 $10.98, Jul 30 - Aug 16 $0.49, Aug 13 2:10 pm $18.27, Aug 15 - Aug 24 $10.98, Jul 30 - Aug 16 $0.43, Aug 15 11:41 am $18.27, Aug 15 - Aug 24 $10.98, Jul 30 - Aug 16 $0.41, Aug 16 9:38 am $18.27, Aug 15 - Aug 24 $9.86, Aug 17 - Aug 26 $0.44, Aug 18 12:22 pm $18.27, Aug 15 - Aug 24 $9.86, Aug 17 - Aug 26 $0.43, Aug 19 6:05 pm $18.27, Aug 15 - Aug 24 $9.86, Aug 17 - Aug 26 $0.50, Aug 20 - Aug 26 $18.51, Aug 26 - Sep 8 $9.86, Aug 17 - Aug 26 $0.50, Aug 20 - Aug 26 $18.51, Aug 26 - Sep 8 $10.98, Aug 27 - Aug 28 $0.45, Aug 28 4:24 am $18.51, Aug 26 - Sep 8 $14.44, Aug 30 8:24 am $0.47, Aug 30 8:24 am $18.51, Aug 26 - Sep 8 $13.91, Sep 1 - Sep 3 $0.39, Sep 1 12:55 pm $18.51, Aug 26 - Sep 8 $13.91, Sep 1 - Sep 3 $0.44, Sep 3 6:36 pm $18.51, Aug 26 - Sep 8 $15.22, Sep 6 12:05 am $0.35, Sep 6 12:05 am $18.51, Aug 26 - Sep 8 $13.91, Sep 8 5:16 am $0.49, Sep 8 - Sep 10 $18.59, Sep 10 - Sep 20 $13.98, Sep 10 - Sep 18 $0.49, Sep 8 - Sep 10 $18.59, Sep 10 - Sep 20 $13.98, Sep 10 - Sep 18 $0.50, Sep 12 - Sep 14 $18.59, Sep 10 - Sep 20 $13.98, Sep 10 - Sep 18 $0.47, Sep 16 3:45 pm $18.59, Sep 10 - Sep 20 $13.98, Sep 10 - Sep 18 $0.49, Sep 18 5:00 pm $18.59, Sep 10 - Sep 20 $15.19, Sep 20 5:50 pm $0.44, Sep 20 5:50 pm $17.63, Sep 23 - Oct 6 $13.20, Sep 23 - Oct 7 $0.35, Sep 23 3:07 am $17.63, Sep 23 - Oct 6 $13.20, Sep 23 - Oct 7 $0.28, Sep 25 5:15 am $17.63, Sep 23 - Oct 6 $13.20, Sep 23 - Oct 7 $0.25, Sep 26 6:16 am $17.63, Sep 23 - Oct 6 $13.20, Sep 23 - Oct 7 $0.45, Sep 28 6:55 am $17.63, Sep 23 - Oct 6 $13.20, Sep 23 - Oct 7 $0.49, Sep 30 - Oct 6 $15.14, Oct 7 4:49 pm $13.20, Sep 23 - Oct 7 $0.50, Oct 7 4:49 pm $17.83, Oct 8 10:27 pm $13.19, Oct 8 - Oct 20 $3.79, Oct 8 10:27 pm $15.34, Oct 10 - Oct 13 $13.19, Oct 8 - Oct 20 $1.89, Oct 10 11:58 pm $15.34, Oct 10 - Oct 13 $13.19, Oct 8 - Oct 20 $1.80, Oct 13 2:58 am $17.83, Oct 15 - Oct 18 $13.19, Oct 8 - Oct 20 $1.71, Oct 15 - Oct 17 $17.55, Oct 19 - Oct 28 $13.19, Oct 8 - Oct 20 $1.54, Oct 18 - Oct 20 $17.55, Oct 19 - Oct 28 $13.27, Oct 23 - Nov 2 $1.34, Oct 23 2:23 am $17.55, Oct 19 - Oct 28 $13.27, Oct 23 - Nov 2 $1.27, Oct 28 2:09 am $18.51, Nov 2 - Nov 14 $13.27, Oct 23 - Nov 2 $1.14, Nov 2 4:35 am $18.51, Nov 2 - Nov 14 $13.13, Nov 5 - Nov 25 $1.13, Nov 5 1:49 am $18.51, Nov 2 - Nov 14 $13.13, Nov 5 - Nov 25 $1.12, Nov 8 2:37 pm $18.51, Nov 2 - Nov 14 $13.13, Nov 5 - Nov 25 $1.09, Nov 14 3:05 am $17.46, Nov 17 - Jan 1 $13.13, Nov 5 - Nov 25 $1.07, Nov 17 8:28 pm $17.46, Nov 17 - Jan 1 $13.13, Nov 5 - Nov 25 $1.06, Nov 20 - Nov 21 $17.46, Nov 17 - Jan 1 $13.13, Nov 5 - Nov 25 $1.65, Nov 22 - Nov 27 $17.46, Nov 17 - Jan 1 $13.32, Nov 27 - Dec 7 $1.65, Nov 22 - Nov 27 $17.46, Nov 17 - Jan 1 $13.32, Nov 27 - Dec 7 $1.87, Nov 29 12:01 pm $17.46, Nov 17 - Jan 1 $13.32, Nov 27 - Dec 7 $1.86, Dec 1 10:56 am $17.46, Nov 17 - Jan 1 $13.32, Nov 27 - Dec 7 $0.38, Dec 3 9:07 am $17.46, Nov 17 - Jan 1 $13.32, Nov 27 - Dec 7 $1.54, Dec 5 7:10 am $17.46, Nov 17 - Jan 1 $13.32, Nov 27 - Dec 7 $1.60, Dec 7 5:02 am $17.46, Nov 17 - Jan 1 $14.13, Dec 9 6:54 am $1.46, Dec 9 6:54 am $17.46, Nov 17 - Jan 1 $15.27, Dec 11 - Dec 15 $1.40, Dec 11 8:49 am $17.46, Nov 17 - Jan 1 $15.27, Dec 11 - Dec 15 $1.37, Dec 12 7:55 am $17.46, Nov 17 - Jan 1 $15.27, Dec 11 - Dec 15 $1.31, Dec 14 6:12 am $17.46, Nov 17 - Jan 1 $15.27, Dec 11 - Dec 15 $1.28, Dec 15 6:10 am $17.46, Nov 17 - Jan 1 $15.63, Dec 17 5:44 am $1.22, Dec 17 5:44 am $17.46, Nov 17 - Jan 1 $13.32, Dec 18 5:51 am $1.19, Dec 18 5:51 am $17.46, Nov 17 - Jan 1 $15.37, Dec 22 1:40 pm $1.65, Dec 22 - Dec 25 $17.46, Nov 17 - Jan 1 $15.22, Dec 23 4:28 pm $1.65, Dec 22 - Dec 25 $17.46, Nov 17 - Jan 1 $15.19, Dec 24 3:49 pm $1.65, Dec 22 - Dec 25 $17.46, Nov 17 - Jan 1 $15.13, Dec 26 - Dec 27 $1.79, Dec 26 10:40 pm $17.46, Nov 17 - Jan 1 $15.10, Dec 28 6:15 pm $1.65, Dec 28 6:15 pm $17.46, Nov 17 - Jan 1 $15.07, Dec 30 1:25 am $1.59, Dec 30 1:25 am $17.46, Nov 17 - Jan 1 $15.63, Dec 30 11:12 pm $1.58, Dec 30 11:12 pm $17.46, Nov 17 - Jan 1 $15.49, Jan 1 1:40 pm $1.55, Jan 1 1:40 pm $17.77, Jan 11 - Apr 1 $15.20, Jan 11 - Jan 16 $1.80, Jan 11 - Jan 28 $17.77, Jan 11 - Apr 1 $15.69, Jan 18 - Jan 20 $1.80, Jan 11 - Jan 28 $17.77, Jan 11 - Apr 1 $15.67, Jan 21 - Jan 30 $1.80, Jan 11 - Jan 28 $17.77, Jan 11 - Apr 1 $15.67, Jan 21 - Jan 30 $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.65, Jan 31 9:28 pm $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.59, Feb 2 5:59 pm $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.18, Feb 4 12:08 pm $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.14, Feb 6 6:13 am $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.12, Feb 7 4:37 am $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.08, Feb 9 12:15 am $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $14.98, Feb 10 7:13 pm $2.83, Jan 30 - Feb 10 $17.77, Jan 11 - Apr 1 $15.00, Feb 12 2:50 pm $2.82, Feb 12 2:50 pm $17.77, Jan 11 - Apr 1 $14.90, Feb 14 9:45 am $2.44, Feb 14 9:45 am $17.77, Jan 11 - Apr 1 $14.88, Feb 15 - Feb 17 $2.38, Feb 15 8:29 am $17.77, Jan 11 - Apr 1 $14.88, Feb 15 - Feb 17 $2.29, Feb 17 8:08 am $17.77, Jan 11 - Apr 1 $14.60, Feb 19 4:56 am $2.20, Feb 19 4:56 am $17.77, Jan 11 - Apr 1 $14.50, Feb 21 2:40 am $2.12, Feb 21 2:40 am $17.77, Jan 11 - Apr 1 $14.46, Feb 23 12:35 am $2.04, Feb 23 12:35 am $17.77, Jan 11 - Apr 1 $14.40, Feb 24 10:00 pm $1.96, Feb 24 10:00 pm $17.77, Jan 11 - Apr 1 $13.74, Feb 26 8:12 pm $1.79, Feb 26 - Feb 28 $17.77, Jan 11 - Apr 1 $15.65, Feb 28 5:23 pm $1.79, Feb 26 - Feb 28 $17.77, Jan 11 - Apr 1 $15.61, Mar 3 7:24 am $1.69, Mar 3 - Mar 7 $17.77, Jan 11 - Apr 1 $15.47, Mar 5 6:44 am $1.69, Mar 3 - Mar 7 $17.77, Jan 11 - Apr 1 $15.34, Mar 7 6:33 am $1.69, Mar 3 - Mar 7 $17.77, Jan 11 - Apr 1 $15.22, Mar 9 5:40 am $1.60, Mar 9 5:40 am $17.77, Jan 11 - Apr 1 $15.12, Mar 11 12:55 pm $1.58, Mar 11 12:55 pm $17.77, Jan 11 - Apr 1 $15.04, Mar 13 7:52 pm $1.57, Mar 13 7:52 pm $17.77, Jan 11 - Apr 1 $14.98, Mar 16 9:57 pm $1.56, Mar 16 9:57 pm $17.77, Jan 11 - Apr 1 $14.93, Mar 19 1:00 am $1.55, Mar 19 1:00 am $17.77, Jan 11 - Apr 1 $14.89, Mar 21 4:54 am $1.49, Mar 21 4:54 am $17.77, Jan 11 - Apr 1 $14.85, Mar 23 11:48 am $1.42, Mar 23 11:48 am $17.77, Jan 11 - Apr 1 $14.80, Mar 25 6:54 pm $1.45, Mar 25 6:54 pm $17.77, Jan 11 - Apr 1 $14.75, Mar 28 3:14 am $1.34, Mar 28 3:14 am $17.77, Jan 11 - Apr 1 $14.71, Mar 30 11:22 am $1.23, Mar 30 11:22 am $17.77, Jan 11 - Apr 1 $14.65, Apr 1 11:48 pm $1.08, Apr 1 11:48 pm $17.59, Apr 4 - Apr 10 $14.60, Apr 4 2:26 pm $0.68, Apr 4 - Apr 23 $17.59, Apr 4 - Apr 10 $14.55, Apr 7 5:39 am $0.68, Apr 4 - Apr 23 $17.59, Apr 4 - Apr 10 $14.49, Apr 10 12:15 am $0.68, Apr 4 - Apr 23 $17.41, Apr 12 - Apr 23 $14.44, Apr 12 6:03 pm $0.68, Apr 4 - Apr 23 $17.41, Apr 12 - Apr 23 $14.38, Apr 15 2:42 pm $0.68, Apr 4 - Apr 23 $17.41, Apr 12 - Apr 23 $14.33, Apr 18 4:01 am $0.68, Apr 4 - Apr 23 $17.41, Apr 12 - Apr 23 $14.28, Apr 20 7:31 pm $0.68, Apr 4 - Apr 23 $17.41, Apr 12 - Apr 23 $14.22, Apr 23 1:14 pm $0.68, Apr 4 - Apr 23 OOS $17.41, Apr 26 - Apr 28 $14.16, Apr 26 5:41 pm $0.68, Apr 26 - Apr 28 OOS $17.41, Apr 26 - Apr 28 $14.13, Apr 28 6:34 am $0.68, Apr 26 - Apr 28 OOS $20.45, May 1 - Mar 25 $14.07, May 1 1:16 am $0.62, May 1 1:16 am OOS $20.45, May 1 - Mar 25 $14.02, May 3 5:39 pm $0.45, May 3 5:39 pm OOS $20.45, May 1 - Mar 25 $13.97, May 6 12:06 pm $0.32, May 6 12:06 pm OOS $20.45, May 1 - Mar 25 $13.92, May 10 3:19 pm $0.14, May 10 3:19 pm OOS $20.45, May 1 - Mar 25 $13.80, May 13 9:34 pm $0.01, May 13 - May 17 OOS $20.45, May 1 - Mar 25 $13.68, May 17 2:43 pm $0.01, May 13 - May 17 OOS $20.45, May 1 - Mar 25 $13.59, May 22 12:56 am $1.89, May 22 - Jun 6 OOS $20.45, May 1 - Mar 25 $13.41, May 26 3:30 am $1.89, May 22 - Jun 6 OOS $20.45, May 1 - Mar 25 $13.37, May 28 8:47 am $1.89, May 22 - Jun 6 OOS $20.45, May 1 - Mar 25 $13.27, Jun 1 11:47 pm $1.89, May 22 - Jun 6 OOS $20.45, May 1 - Mar 25 $13.18, Jun 6 3:19 pm $1.89, May 22 - Jun 6 OOS $20.45, May 1 - Mar 25 $13.10, Jun 10 6:59 pm $1.54, Jun 10 6:59 pm OOS $20.45, May 1 - Mar 25 $13.02, Jun 14 3:04 pm $1.75, Jun 14 3:04 pm OOS $20.45, May 1 - Mar 25 $15.73, Jun 18 9:23 am $1.65, Jun 18 9:23 am OOS $20.45, May 1 - Mar 25 $15.32, Jun 22 3:21 am $1.53, Jun 22 3:21 am OOS $20.45, May 1 - Mar 25 $15.15, Jun 25 11:09 pm $1.28, Jun 25 11:09 pm OOS $20.45, May 1 - Mar 25 $15.07, Jun 30 12:17 am $0.99, Jun 30 12:17 am OOS $20.45, May 1 - Mar 25 $14.98, Jul 4 5:54 am $1.83, Jul 4 5:54 am OOS $20.45, May 1 - Mar 25 $14.90, Jul 8 3:41 pm $1.88, Jul 8 3:41 pm OOS $20.45, May 1 - Mar 25 $14.82, Jul 11 5:53 pm $1.70, Jul 11 5:53 pm OOS $20.45, May 1 - Mar 25 $14.68, Jul 15 9:27 am $1.89, Jul 15 - Jul 24 OOS $20.45, May 1 - Mar 25 $14.53, Jul 18 10:54 pm $1.89, Jul 15 - Jul 24 OOS $20.45, May 1 - Mar 25 $14.36, Jul 22 1:50 pm $1.89, Jul 15 - Jul 24 OOS $20.45, May 1 - Mar 25 $14.32, Jul 24 9:38 am $1.89, Jul 15 - Jul 24 OOS $20.45, May 1 - Mar 25 $14.20, Jul 27 11:14 pm $2.15, Jul 27 11:14 pm OOS $20.45, May 1 - Mar 25 $14.10, Jul 31 1:49 pm $2.48, Jul 31 1:49 pm OOS $20.45, May 1 - Mar 25 $14.05, Aug 4 3:39 am $1.86, Aug 4 3:39 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $0.41, Aug 7 7:31 pm OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.49, Aug 11 - Aug 13 OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.88, Aug 17 8:22 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $3.50, Aug 21 2:33 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.89, Aug 24 7:35 pm OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.84, Aug 26 5:57 pm OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.72, Aug 30 11:45 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.62, Sep 3 7:13 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.80, Sep 7 4:48 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.86, Sep 11 2:15 am OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.56, Sep 14 10:38 pm OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.49, Sep 18 7:36 pm OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.44, Sep 22 5:38 pm OOS $20.45, May 1 - Mar 25 $15.94, Aug 7 - Sep 26 $1.37, Sep 26 3:34 pm OOS $20.45, May 1 - Mar 25 $15.82, Sep 30 2:37 pm $1.25, Sep 30 2:37 pm OOS $20.45, May 1 - Mar 25 $15.51, Oct 4 4:26 pm $1.13, Oct 4 4:26 pm OOS $20.45, May 1 - Mar 25 $14.79, Oct 8 7:44 pm $1.02, Oct 8 7:44 pm OOS $20.45, May 1 - Mar 25 $14.41, Oct 12 8:31 pm $0.92, Oct 12 8:31 pm OOS $20.45, May 1 - Mar 25 $14.08, Oct 16 6:39 pm $0.82, Oct 16 6:39 pm OOS $20.45, May 1 - Mar 25 $13.75, Oct 20 3:43 pm $0.72, Oct 20 3:43 pm OOS $20.45, May 1 - Mar 25 $13.40, Oct 24 12:25 pm $0.58, Oct 24 12:25 pm OOS $20.45, May 1 - Mar 25 $13.05, Oct 28 10:54 am $0.49, Oct 28 10:54 am OOS $20.45, May 1 - Mar 25 $12.69, Nov 1 9:51 am $0.44, Nov 1 9:51 am OOS $20.45, May 1 - Mar 25 $12.28, Nov 5 11:40 am $0.36, Nov 5 11:40 am OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.26, Nov 9 1:48 pm OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.20, Nov 13 4:28 pm OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.12, Nov 17 11:45 pm OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.01, Nov 22 - Dec 6 OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.02, Dec 11 5:53 pm OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.01, Dec 14 - Dec 29 OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $0.64, Jan 3 1:21 am OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $1.00, Jan 7 10:39 pm OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $1.12, Jan 12 - Jan 30 OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $1.49, Feb 4 - Mar 7 OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $1.35, Mar 13 6:28 pm OOS $20.45, May 1 - Mar 25 $11.99, Nov 9 - Mar 25 $1.10, Mar 25 4:43 pm
67,264 1,176,126
1,562,500
1,041,667
520,833
Oct
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2015
2016
Price Details
New
Latest
$20.45 Mar 25, '16
Highest
$20.45 May 1, '15
Lowest
$15.14 Oct 7, '14
Average
$20.45 (30d avg) $20.45 (90d avg) $20.45 (180d avg) $20.17 (365d avg) $19.24 (Lifetime average)
Added
Jul 30, 2014
3rd Party New
Latest
$11.99 Mar 25, '16
Highest
$15.94 Aug 7, '15
Lowest
$9.86 Aug 17, '14
Average
$11.99 (30d avg) $11.99 (90d avg) $12.44 (180d avg) $13.61 (365d avg) $13.70 (Lifetime average)
Added
Jul 30, 2014
3rd Party Used
Latest
$1.10 Mar 25, '16
Highest
$3.79 Oct 8, '14
Lowest
$0.01 Dec 14, '15
Average
$1.43 (30d avg) $1.18 (90d avg) $0.79 (180d avg) $1.10 (365d avg) $1.20 (Lifetime average)
Added
Jul 30, 2014
Sales Rank
30 day average: 660,257 90 day average: 870,486
Product Description
is the definitive guide to our incredible, ever-changing world. This is the single-volume reference every forward-looking library should include, sure to foster the next generations sense of connectedness with our world and to inspire the ecologists and scientists of tomorrow.
Written by renowned international authority Michael Allaby, this lively encyclopedia gives kids a rock-solid foundation, reveals the latest research on fragile ecosystems and climate shift, and engages young readers with riveting information, eye-catching illustrations, and, of course, peerless National Geographic photography.
How do twisters form? What makes lightening strike? Why are tropical rain forests the lungs of our planet? Curious kids want to know everything about their planet. Theyll find the answers to their questions here, as they investigate our world from its core to its cosmic connections.
offers a wealth of comprehensive, easy-to-follow insight into our planet in lively, fun-to-read text.
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