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1
Foundation for Environmental Conservation. | Elsevier Sequoia. | 1974
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2
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3
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4
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5
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6
Phillips, Martin | Prentice Hall | 2000
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7
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8
Laycock, George | published in cooperation with the National Audubon | 1971
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9
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10
Vos, Claire C. | Chapman & Hall | 1993
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