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Key to subject index of experiment station literature.

APA Citation

United States. Department of Agriculture. States Relations Service. (1921). Key to subject index of experiment station literature. Revised. Washington: U.S. Govt. Print. Off..

MLA Citation

United States. Department of Agriculture. States Relations Service. Key to Subject Index of Experiment Station Literature. Revised. Washington: U.S. Govt. Print. Off., 1921.

Warning: These citations may not always be complete (especially for serials).