Original photograph: 13 x 18 cm, black & white photo, caption under photo reads "KP-1797-R2. Pumping Plant "D" Enlargement. One-half section of inside barrel forms for 36" diameter discharge pipes for Units 4 and 5. C. O. Wamstad, Photo. June 3, 1949", from Black Binders Digital reproduction of photograph: KP-1797-R2. Pumping Plant "D" Enlargement, Black Binders, Bureau of Reclamation