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A Versatile, Bibliographic Punched Card System for Agronomists¹

A versatile, inexpensive, simply operated punched card system is described. Cards may be sorted according to 1) author, 2) biological organism, 3) two separate topics, 4) two external environmental factors affecting the organism, or 5) article type. The system is readily adaptable to scientists in many research disciplines.

² Assistant Agronomist, Colorado Agricultural Experiment Station, Grand Junction, Colorado; and Agronomist, Colorado State University, Fort Collins, Colorado.

Received for publication July 28, 1967.