Date: | 1967 |
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Description: | Worker spraying Elm trees with DDT pumped from a tank hitched to the back of a vehicle equipped with a snow plow. |
Date: | 1915 |
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Description: | A student is using a pointer to direct the attention of seated students toward a poster labeled "Life Cycle of a Fly" during a lesson on the dangers of hou... |
Date: | |
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Description: | View from front of a man on a motorcycle squirting fuel oil into a sewer opening at a curb to control mosquitoes. The motorcycle has an oil tank attached l... |
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