 | Worley, D. P. (David Perry), | (1) |
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 | Worley, D. P. (David Perry), 1921-; The "let-it-grow" treatment for timber : is it economically worthwhile? / by David P. Worley. Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1970. | |
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