Mr. Waite testing the validity of pear blight germs by inoculation, Department grounds, July, 1893.

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Unknown. “Mr. Waite testing the validity of pear blight germs by inoculation, Department grounds, July, 1893..” Special Collections, USDA National Agricultural Library. Accessed October 15, 2024, https://www.nal.usda.gov/exhibits/speccoll/items/show/299.