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http://www.nal.usda.gov/speccoll/collect/screwworm/chapters/05/008.htm
"Cobalt 60 Source Employed in Irradiating Pupae of the Screwworm Fly" by Agricultural Research Service, United States Department of Agriculture. Edward F. Knipling Papers, Screwworm Eradication Collection, Special Collections, National Agricultural Library.
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