TY  - BOOK
AB  - Brief 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.
AU  - Hirsch, S. Carl.
CN  - QH541.14 .H57 1971
CN  - QH541.14
CY  - New York,
DA  - [1971]
ET  - [1st ed.]
ID  - 54479
KW  - Ecology
KW  - Conservation of natural resources
KW  - Naturalists.
KW  - Conservation of natural resources.
KW  - Ecology.
N2  - Brief 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.
PB  - Viking Press
PP  - New York,
PY  - [1971]
SN  - 0670356468
T1  - Guardians of tomorrow;pioneers in ecology
TI  - Guardians of tomorrow;pioneers in ecology
ER  -