00613cam a2200205 7i4500 0000001400 20070208090000.0 19990710000000.0 060420 0813807956 GB661 .H55 1975 Hjelmfelt Hydrology for engineers and planners A. T. Hjelmfelt, J. J. Cassidy. Iowa: Iowa State University Press, 1975. x,210p.: ill.; 24 cm. Includes bibliographical references Civil engineering Hydrology Cassidy, J. J. 0000001759 Book Open Shelf HQ Library