1938 SLA (Salt Lake Aqueduct)
The 1938 SLA (Salt Lake Aqueduct, Utah) vertical, black and white (panchromatic) aerial project was acquired by the U.S. Bureau of Reclamation (USBR) at a scale of 1:20,000 (1 inch equals 2000 feet) and consists of 1 index sheet and 183 images.