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2. Hershfield , David M. Rainfall frequency atlas of the U.S. for durations from 30 minutes to 24 hours and return periods from 1 to 100 years Washington, D. C. 1961
3. In defense of experimental watersheds;Hewlett;Water Resour. Res.,1969
4. Hewlett , John D. Wade L. Nutter The relation of the variable source area concept to hydrologic modelling Conference on Hydrologic Models in Water Resources Planning Clemson, S.C. 1970