Original photograph: 13 x 10 cm, black & white photo, caption under photo reads "KP-2403-R2 - CLEAR LAKE - Klamath Project. Underwater soil sampling procedure. Lifting and unscrewing sections of Vehmeir tube. K. J. Greene, Photo. Oct. 16, 1957", from Black Binders Digital reproduction of photograph: KP-2403-R2 - CLEAR LAKE - Klamath Project, Black Binders, Bureau of Reclamation