 | Insect pests. | (2) |
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 | Insect enemies of yellow-poplar / by Denver P. Burns. Burns, Denver P. cn Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1970. | |
| Distribution of insect pests in cottonfields / Fye, R. E. (Robert Eaton), 1924- 1n Washington, D.C. : Agricultural Research Service, U.S. Dept. of Agriculture, 1969. | |
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