Descriptive InformationOriginal Captions: On horseback; Supt. J. Ross Eakin; Arthur P. Miller; USPHS; Oliver S. Taylor, Chief Engineer. Preliminary Survey; IV-P-16419, Miscellaneous - Personnel.On horseback; Supt. J. Ross Eakin; Arthur P. Miller; USPHS; Oliver S. Taylor, Chief Engineer.Preliminary Survey, IV-P-16419, Miscellaneous - Personnel