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R. R. Humphrey, 1966
University of Arizona, Department of Range Management, us
#1524090
R. R. Humphrey, 1964
University of Arizona, us
#1561338
R. R. Humphrey, 1959
University of Arizona, Department of Watershed Management, us
#1495284
R. R. Humphrey, 1957
University of Arizona, Department of Agronomy and Range Management, us
#1541241
R. R. Humphrey, 1953
University of Arizona, Botany and Range Ecology, us
#1552929
R. R. Humphrey, 1952
University of Arizona, Department of Botany and Range Ecology, us
#1572790
R. R. Humphrey, 1950
University of Arizona, us
#1503171