 | Pine Seeds. | (2) |
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 | Seed losses to small mammals after fall sowing of pine seed / by Raymond E. Graber. Graber, Raymond E. Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1969. | |
| The identification of primary red pine cone insects / John S. Hard. Hard, John S. cn : Lake States Forest Experiment Station, Forest Service, U.S. Department of Agriculture, 1964. | |
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