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MLA

Himmelberger, David U, et al. "Idaho Crop Identification Key." ,

APA

Himmelberger, D. U, United States, U. States, Department of Agriculture, D. of Agriculture, Statistical Reporting Service, S. Reporting Service, & Standards and Research Division, S. and Research Division. (1971). Idaho crop identification key.

Chicago

Himmelberger, David U., United States, Department of Agriculture, Statistical Reporting Service, and Standards and Research Division. "Idaho crop identification key" (1971):