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Ryan, John C.

Life support : conserving biological diversity / John C. Ryan, - Washington : Worldwatch Institute (WI) , 1992 - 62p. : ill. ; 20cm. - Worldwatch paper No. 108 .

Includes bibliographical references.

Subjects--Topical Terms:
Life
Ecosystems

Gov. Doc. Class. No.: US WI P-108

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