Original photograph: 18 x 13 cm, black & white photo, caption under photo reads "KP-1495-R2 - Klamath Project. Leaf moss, Richardson's Pond Weed, in J-13 Lateral before treating. R. S. Hopkins, Photographer. June 10, 1947", from Black Binders Digital reproduction of photograph: KP-1495-R2 - Klamath Project, Black Binders, Bureau of Reclamation