Schleusener, Richard A., authorCivil Engineering Section, Colorado State University, publisher2019-07-092019-07-091961-01-15https://hdl.handle.net/10217/195689CER61RAS7.Final Report to National Science Foundation on Research.15 January 1961.technical reportsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Hail -- ColoradoHail control -- ColoradoText