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    This report will describe the effect of self-, cross-, and open- or wind-pollination on seed and seedling production of 19 ponderosa pine (Pinus ponderosa Laws.) trees in the eastern foothills of the Cascade Mountains south of Bend, Oreg. The study is part of a continuing investigation of self-fertility in several conifers growing in the Pacific Northwest to evaluate the effect of inbreeding on fertility and vigor and to provide information which may be useful in regeneration and tree improvement programs in these species.

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    Sorensen, Frank C. 1970. Self-fertility of a central Oregon source of ponderosa pine. Res. Pap. PNW-RP-109. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 12 p

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