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1
Pyrethrum, the natural insecticide.
New York, Academic Press 1973

Conference Proceeding Libro
2
Arid lands in transition; [papers]
Washington [American Association for the Advancement of Science] 1970

Conference Proceeding Libro
3
Second World Conference on National Parks.
Morges, Switzerland, Published for National Parks Centennial Commission by International Union for Conservation of Nature and Natural Resources, 1974

Conference Proceeding Libro
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