Unknown2018-12-142018-12-141966EPM-068-07-003http://hdl.handle.net/20.500.11867/149092 sheets 8.5 x 11 inch. Typed. First sheet annotated in black crayon.Information about the light effects at the dam, to assist photographers. The lights are intended to symbolize different times of the day and different seasons.Dams--Grand Coulee;