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MLA

Merrill, Elmer D, United States Division of Agrostology, and United States Department of Agriculture. Some Arizona grasses. U.S. Dept. of Agriculture, Division of Agrostology, 1901.

APA

Merrill, Elmer D, United States Division of Agrostology, and United States Department of Agriculture. (1901). Some Arizona grasses. U.S. Dept. of Agriculture, Division of Agrostology.

Chicago

Merrill, Elmer D., United States Division of Agrostology, and United States Department of Agriculture. Some Arizona grasses. U.S. Dept. of Agriculture, Division of Agrostology, 1901.