Original photograph: 13 x 10 cm, black & white photo, caption under photo reads "KP-2401-R2 - CLEAR LAKE - Klamath Project Underwater soil sampling raft. Raft is propelled by one 15 H.P. and one 10 H.P. outboard motor. K. J. Greene, Photo. Oct. 16, 1957", from Black Binders Digital reproduction of photograph: KP-2401-R2 - CLEAR LAKE - Klamath Project, Black Binders, Bureau of Reclamation