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Howard E. Ray, 1965
University of Arizona, Soils and Extension Education, us
#1557859
Howard E. Ray, 1965
University of Arizona, us
#1583258
Howard E. Ray, 1960
University of Arizona, us
#1521295
Howard E. Ray, 1959
University of Arizona, Agronomy Department, us
#1548487
Howard E. Ray, 1959
University of Arizona, us
#1580244
Howard E. Ray, 1954
University of Arizona, Agricultural Extension Service, us
#1523105
Howard E. Ray, 1954
University of Arizona, us
#1540081
Howard E. Ray, 1953
University of Arizona, us
#1494815
Howard E. Ray, 1953
University of Arizona, us
#1498379
Howard E. Ray, 1953
University of Arizona, us
#1580377