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000054479 0500_ $$aQH541.14$$b.H57 1971
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000054479 099__ $$aQH541.14 .H57 1971$$a574.5 H
000054479 1001_ $$aHirsch, S. Carl.
000054479 24510 $$aGuardians of tomorrow;$$bpioneers in ecology$$c[by] S. Carl Hirsch. Illustrated by William Steinel.
000054479 250__ $$a[1st ed.]
000054479 260__ $$aNew York,$$bViking Press$$c[1971]
000054479 300__ $$a192 p.$$billus. (part col.), ports.$$c24 cm.
000054479 504__ $$aBibliography: p. [181]-182.
000054479 520__ $$aBrief biographies of eight American pioneers in conservation and ecology: Henry David Thoreau, George Perkins Marsh, Frederick Law Olmsted, John Muir, Gifford Pinchot, George Norris, Aldo Leopold, and Rachel Carson.
000054479 650_0 $$aEcology$$zUnited States$$xHistory.
000054479 650_0 $$aConservation of natural resources$$zUnited States$$xHistory.
000054479 650_0 $$aNaturalists.
000054479 650_1 $$aConservation of natural resources.
000054479 650_1 $$aEcology.
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000054479 980__ $$aBOOK