 | Forest insects Control Congresses. | (1) |
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 | Toward integrated control : proceedings of the third annual Northeastern Forest Insect Work Conference, New Haven, Connecticut, 17-19 February, 1970. Northeastern Forest Insect Work Conference (3rd : 1970 : New Haven) mn Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1971. | |
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