 | Insecticides Testing. | (2) |
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 | Contact, residue, and vapor toxicity of new insecticides to stored-product insects: II / . Speirs, Roy D. (Roy Dean), 1928- 4n Washington, D.C. : Agricultural Research Service, U.S. Dept. of Agriculture, 1970. | |
| Materials screened as animal systemic insecticides at Kerrville, Texas, 1960-1967 / . Drummond, Roger O., 1931- 1n Washington, D.C. : Agricultural Research Service, U.S. Dept. of Agriculture, 1970. | |
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