Alexander, R. R. (1982). Engelmann spruce seed production on the Fraser Experimental Forest, Colorado. Fort Colins, Colo.: USDA Forest Service, Rocky Mountain Forest and Range Experiment Station.MLA Citation
Alexander, Robert R. Engelmann Spruce Seed Production On the Fraser Experimental Forest, Colorado. Fort Colins, Colo.: USDA Forest Service, Rocky Mountain Forest and Range Experiment Station, 1982.
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