Original photograph: 18 x 13 cm, black & white photo, caption under photo reads "KP-1640-R2 - Klamath Project. Tule Lake Main Dike Exploration, Diamond Drill Recovery Sample on D. H. 17, 35 to 40 feet. L. H. Wollenberg, Photo. February 12, 1948", from Black Binders Digital reproduction of photograph: KP-1640-R2 - Klamath Project, Black Binders, Bureau of Reclamation