Sorensen, Frank C. - Biodiversity Heritage Library

Effects of stratification and temperature on seed germination speed and uniformity in central Oregon ponderosa pine (Pinus ponderosa Dougl. ex Laws.)

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By: Weber, John C. - Sorensen, Frank C.

Publication info: [Portland, Or.], U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, 1990

Holding Institution: U.S. Department of Agriculture, National Agricultural Library

Genetic variation and seed transfer guidelines for ponderosa pine in central Oregon

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By: Sorensen, Frank C. - Pacific Northwest Research Station (Portland, Or.)

Publication info: Portland, Or. (333 S.W. First Avenue, P.O. Box 3890, Portland 97208-3890), U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [1994]

Holding Institution: U.S. Department of Agriculture, National Agricultural Library

Self-fertility of a central Oregon source of Ponderosa pine

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By: Sorensen, Frank C.

Publication info: Portland, Or, Pacific Northwest Forest and Range Experiment Station, U.S. Dept. of Agriculture, Forest Service, 1970

Holding Institution: U.S. Department of Agriculture, National Agricultural Library