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close this section of the librarySlopes (Physical geography)(1)
View the documentPotential solar beam irradiation on slopes tables for 30Ûp0Ûs to 50Ûp0Ûs latitude / by Ernest C. Frank and Richard Lee. Frank, Ernest C. (Ernest Charles) Fort Collins, Colo. : Rocky Mountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1966.