Hitchcock, A. S. 1865-1935. Cultivated forage crops of the Northwestern States. By A.S. Hitchcock ... - Washington, Govt. Print. Off., 1902. - 28 p. VII pl. 26 cm. - United States. Dept. of Agriculture. Bureau of Plant Industry. Bulletin no. 31 . LCCN: agr09000157 Subjects--Topical Terms: Forage plants--Northwestern States. LC Class. No.: QK1 / .U45 no. 31