Aerial Photo for Coffey, Lyon Region, locality Gridley, location T. 20 S., R 13-14 E., quadrangle Hartford, project GS-VENU. Date of photo 1978-03-28. Other info Flights 1, 2, 3 EW 19000. Range of sheets 1-66 to 69, 1-96 to 92, 1-97 to 101. Number of sheets 14. Photo is located at T. 20 S., R 13-14 E.