- Lessons amid the Rubble: An Introduction to Post-Disaster Engineering and Ethics (Johns Hopkins Introductory Studies in the Hist
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| Highest | $24.95 Mar 7, '16 |
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| Average | $23.80 (30d avg) $23.37 (90d avg) $24.16 (180d avg) $23.64 (365d avg) $23.49 (Lifetime average) |
| Added | Feb 5, 2015 |
| Latest | $14.56 Mar 30, '16 |
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| Average | $14.56 (30d avg) $15.02 (90d avg) $15.88 (180d avg) $12.53 (365d avg) $12.34 (Lifetime average) |
| Added | Feb 5, 2015 |
| Latest | $11.50 Mar 30, '16 |
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| Average | $13.97 (30d avg) $13.50 (90d avg) $13.46 (180d avg) $9.91 (365d avg) $9.86 (Lifetime average) |
| Added | Feb 5, 2015 |
30 day average: 771,516
90 day average: 804,234