Seed crops of forest trees in the pine region of California /
by H.A. Fowells and G.H. Schubert.
- Washington : U.S. Dept. of Agriculture, 1956.
- ii, 48 p. : ill., maps ; 23 cm.
- Technical bulletin / United States Department of Agriculture ; no. 1150 .
- Technical bulletin (United States. Department of Agriculture) ; no. 1150. .