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Source:
Science. 10/19/1990, Vol. 250 Issue 4979, p451. 2p.
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Source:
Environment. May90, Vol. 32 Issue 4, p10. 9p. 1 Black and White Photograph.
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Source:
Issues in Science & Technology. Fall90, Vol. 7 Issue 1, p81. 4p.
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Environment. Oct90, Vol. 32 Issue 8, p23-23. 1/3p.
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Environment. May90, Vol. 32 Issue 4, preceding p2-2. 1/3p.
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Professional Geographer. May90, Vol. 42 Issue 2, p272-272. 2/3p.
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Source:
BioScience. Dec90, Vol. 40 Issue 11, p818-826. 9p. 1 Black and White Photograph, 2 Diagrams, 4 Charts, 4 Graphs, 4 Maps.
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