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MLA

Rolfs, P. H. (Peter Henry). Citrus fruit growing in the Gulf states. U.S. Dept. of Agriculture, 1906.

APA

Rolfs, P. H. (Peter Henry). (1906). Citrus fruit growing in the Gulf states. U.S. Dept. of Agriculture.

Chicago

Rolfs, P. H. (Peter Henry) Citrus fruit growing in the Gulf states. U.S. Dept. of Agriculture, 1906.