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University of Arizona. Agricultural Extension Service. County Agricultural Agents., 1940
University of Arizona, us
#1559209
University of Arizona. Agricultural Extension Service. County Agricultural Agents., 1940
University of Arizona, us
#1560044
Leo. Brossard, 1940
McGill University, Department of Geology., ca
#1570694
University of Arizona. Agricultural Extension Service. County Agricultural Agents., 1940
University of Arizona, us
#1572252
George Francis Kosco, 1940
Naval Postgraduate School, us
#1575552
University of Arizona. Agricultural Extension Service. County Agricultural Agents., 1940
University of Arizona, us
#1587891
John Charnetski, 1940
University of Saskatchewan, ca
#1886198
Albert Ernest. Moss, 1939
McGill University, Department of Geology., ca
#1506053
Edward Arthur. Hart, 1939
McGill University, Department of Geology., ca
#1529361
Burton Wilbur Adkinson, 1939
University of Washington, us
#1532662