Life cycle of intestinal roundworms (Ascaris lumbricoides var. suum) in swine diagram. Illustration in "Internal Parasites of Swine", Farmers' Bulletin 1787, 1961. Figure 11.

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Citation

E.B.F.. 1936. “Life cycle of intestinal roundworms (Ascaris lumbricoides var. suum) in swine diagram. Illustration in "Internal Parasites of Swine", Farmers' Bulletin 1787, 1961. Figure 11..” Special Collections, USDA National Agricultural Library. Accessed August 19, 2022, https://www.nal.usda.gov/exhibits/speccoll/items/show/8091.