Original photograph: 13 x 10 cm, color photograph, caption under photo reads “CN-12-200-59A Klamath Project, Oregon-California. Gerber Dam Core Drilling Program. View showing hollow core drill bit. October 1969. Bureau of Reclamation photo by C.D.Lawrence" from Black Binders Digital reproduction of photograph: CN-12-200-59A Klamath Project - Oregon, Black Binders, Bureau of Reclamation
