Original photograph: 17 x 12 cm, black & white photo, with "A" written in front in pencil, "160" in red ink, caption under photo reads "#84. Main Canal, Div.2, showing derrick use in excavating. D.W.M. 1/12/07", from Brown Album, reorganized by Elaine Roggensees, 1987 Digital reproduction of photograph: Main Canal, Div.2 showing derrick use in excavating, Brown Album, Bureau of Reclamation