The Aerial Photographs Collection consists of high- and low-altitude, black and white (B/W) and color (C) aerial photographs taken between 1936 and 2002. Flight coverage is mainly in Virginia, but there is also overlap into the adjoining states of Kentucky, Maryland, and West Virginia. Photo coverage is not complete for the entire state for any given flight year. A minor part of the collection (<5%) includes infrared photos. The photos are generally in paper format and suitable for use as stereo pairs. Many of the photos were taken during 1950-60 as part of the U.S. Geological Survey program to photo-revise the topographic map series. Photo-mosaic index maps are unavailable for many of the flight missions.