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W. T. Welchert, 1978
University of Arizona, us
#1502718
W. T. Welchert, 1975
University of Arizona, Department of Soils, Water and Engineering, us
#1516541
W. T. Welchert, 1975
University of Arizona, Department of Soils, Water & Engineering, us
#1546502
W. T. Welchert, 1974
University of Arizona, Agricultural Extension Service, us
#1507443
W. T. Welchert, 1968
University of Arizona, Agricultural Extension Service, us
#1526055
W. T. Welchert, 1965
University of Arizona, us
#1527928
W. T. Welchert, 1965
University of Arizona, us
#1561236
W. T. Welchert, 1965
University of Arizona, Agriculture Extension Service, us
#1562975
W. T. Welchert, 1964
University of Arizona, Agriculture Extension Service, us
#1512628
W. T. Welchert, 1964
University of Arizona, Department of Agricultural Engineering, us
#1585276