 | Conifers. | (2) |
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 | Cone production by upper-slope conifers / Jerry F. Franklin. Franklin, Jerry F. cn Portland, Or. : Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, 1968. | |
| Direct seeding of conifers in the lake states : a review of past trials / Eugene I. Roe. Roe, Eugene I. (Eugene Irving), 1904- : Lake States Forest Experiment Station, Forest Service, U.S. Department of Agriculture, 1963. | |
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