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| 41. | 
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| | Tree Homes: Preschool-1 (Great Explorations in Math & Science)
Author: Jean C. Echols
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Publication Date: May 1998
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| 42. | 
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| | Schoolyard Ecology
Authors: Katharine Barrett, Carolyn Willard
Buy New: $18.00
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Publication Date: 2001
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| 43. |  | | Conservation Biology: Concepts and Applications
Author: George W Cox
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Sales Rank: 1351643
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Publication Date: December 1, 1996
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| 44. | | | How to Know the Beetles
Authors: Ross H Arnett, N. M Downie, Wm. G Jaques, John Bamrick, Edward T Cawley
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Rating: 1 reviews
Sales Rank: 1633705
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Publication Date: March 1, 1980
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| 45. | | | How to Know the Trees (Pictured Key Nature Series)
Authors: Howard Miller, John Bamrick, Edward T Cawley, Wm. G Jaques
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Sales Rank: 2399997
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Publication Date: April 1, 1978
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| 46. | 
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| | Handbook of Estimation Methods in Ecotoxicology and Environmental Chemistry (Environmental & Ecological (Math) Modeling)
Author: Sven E. Jorgensen
Buy New: $94.95
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Sales Rank: 2913946
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Publication Date: October 15, 1997
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| 47. | | | Economic Effects of Floods (Lecture Notes in Economics & Math Systems)
Author: J D. Brown
Buy Used: $31.00
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Sales Rank: 5071312
Category: Book
Publication Date: October 1972
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Condition: copyright 1972 / minor wear... more
| 48. | | | Earth's caretakers Native American Lessons (Masters Project Math And Science TEachers for Reservation Schools)
Author: Lisa M. Nyberg
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Sales Rank: 4554601
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Publication Date: 1993
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| 49. | | | Ecology Math: Grade 4 and Above
Publisher: Amer Education Pub
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Publication Date: June 1994
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| 50. | | | Curve of the Future: Food-Trees, Solar Cars, War-Math, the Fun Economy and Other Essential Knowledge for A...
Author: Edward Passerini
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Sales Rank: 2688441
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Publication Date: December 1992
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