Word: naphthalin
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Dates: during 1930-1939
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...veterinarians and entomologists were researching frantically last week, but expected the gnats to be gone before they could learn much. Meantime they advised farmers to smear their stock with rancid lard and kerosene, with cottonseed oil and pine tar, or with a mixture of soap, water, petroleum and powdered naphthalin. But what the farmers really hoped for were a few good hot days, which drop gnats dead as quickly as they come...
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