1957 SA (Southern Pacific Lands in Nevada and Utah)

The 1957 SA (Southern Pacific Lands in Nevada and Utah) vertical, black and white (panchromatic) aerial project was acquired by Sloan and Associates (Arcadia, California) for the Southern Pacific Railroad at a scale of 1:63,360 (1 inch equals 5280 feet); 6 inch focal length lens; 400-700 nm spectral range film; 20% sidelap and 60% overlap; 31,000 foot altitude.