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CHITWOOD BG, 1945, NASSAU COUNTY FARM H, V31, P3
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CHITWOOD BG, 1942, P HELMINTH SOC WASH, V12, P39
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FRANKLIN M. T., 1938, JOUR HELMINTHOL, V16, P67, DOI 10.1017/S0022149X00018319
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JOHNSON L. R., 1945, Journal of the Ministry of Agriculture, V52, P266