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Crewman spraying plants with pesticides Everglades National Park; National Park Service
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Mosquitoes on back of crewman treating trees Everglades National Park; National Park Service On slide: Mosquitoes spraying casuarina
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Mosquitoes on back of crewman treating trees Everglades National Park; National Park Service On slide: Mosquitoes; Spraying casuarina
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Man treating single tree in prairie Everglades National Park; National Park Service On slide: Chemical treatment of aquatic weeds in L-67; 11-30-78
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1978-11-30
Yellowstone photo album 31, page 208 Yellowstone National Park
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Circa 1936
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