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MLA

Spillman, W. J. Use of the exponential yield curve in fertilizer experiments . U.S. Dept. of Agriculture, 1933.

APA

Spillman, W. J. (1933). Use of the exponential yield curve in fertilizer experiments. U.S. Dept. of Agriculture.

Chicago

Spillman, W. J. Use of the exponential yield curve in fertilizer experiments . U.S. Dept. of Agriculture, 1933.