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close this section of the libraryProduction & germination of paper birch seed and its dispersal into a forest opening(1)
View the documentProduction & germination of paper birch seed and its dispersal into a forest opening / by John C. Bjorkbom. Bjorkbom, John C., 1915- cn Upper Darby, Pa. : Northeastern Forest Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1971.