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MLA

Shear, C. L. Studies on American grasses : a revision of the North American species of Bromus occurring north of Mexico . U.S. Dept. of Agriculture, Division of Agrostology, 1900.

APA

Shear, C. L. (1900). Studies on American grasses : a revision of the North American species of Bromus occurring north of Mexico. U.S. Dept. of Agriculture, Division of Agrostology.

Chicago

Shear, C. L. Studies on American grasses : a revision of the North American species of Bromus occurring north of Mexico . U.S. Dept. of Agriculture, Division of Agrostology, 1900.