 | Economic analysis of the gypsy moth problem in the northeast | (2) |
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 | Economic analysis of the gypsy moth problem in the northeast. I, Applied to commercial forest stands / by Roger E. McCay and William B. White. McCay, Roger E. Upper Darby, Pa. : Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1973. | |
| Economic analysis of the gypsy moth problem in the northeast. II, Applied to residential property / by Brian R. Payne ... . Upper Darby, Pa. : Forest Service, U.S. Dept. of Agriculture, Northeastern Forest Experiment Station, 1973. | |
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