Robinson, Ron R., authorColorado State University, Civil Engineering Section, publisher2019-09-172019-09-171963-05https://hdl.handle.net/10217/197999CER63RRR38.May 1963.Preliminary Progress Report - for the record (Data from this report are to be extracted for publication).This work was supported by the National Science Foundation.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 -- ColoradoText