Original photograph: 13 x 18 cm, black & white photo, with "NA" written in front in pencil, caption under photo reads "KP-1122-R2 - Klamath Project - Moss in the A-4-Lateral prior to chemical treatment. C. O. Wamstad, Photo July 12, 1945", from Black Binders Digital reproduction of photograph: KP-1122-R2 - Klamath Project, Black Binders, Bureau of Reclamation