Irsfeld, N. W.2017-10-192017-10-191939REC-117-19-080http://hdl.handle.net/20.500.11867/1188Single 9 x 11 inch sheet. Typed."N. W. Irsfeld. Project Engineeer, U. S. Indian Irrigation Service."Statistical dataIrrigationCrop census for 1939 summary: Wapato reservation projects.