 | Trees Wounds and injuries. | (2) |
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 | A photo guide to the patterns of discoloration and decay in living northern hardwood trees / by Alex L. Shigo and Edwin vH. Larson. Shigo, Alex L., 1930- cn Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1969. | |
| Identification & evaluation of defects in eastern white pine logs & trees / by M.D. Ostrander. Ostrander, Myron D. Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1971. | |
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