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MLA

Merrill, Elmer D, United States Division of Agrostology, and United States Department of Agriculture. Aristida purpurea nutt., and its allies . 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). Aristida purpurea nutt., and its allies. U.S. Dept. of Agriculture, Division of Agrostology.

Chicago

Merrill, Elmer D., United States Division of Agrostology, and United States Department of Agriculture. Aristida purpurea nutt., and its allies . U.S. Dept. of Agriculture, Division of Agrostology, 1901.