Aerial photographs, or printed versions known as photomaps, are found in many portions of the collections such as the Edgar Tobin Aerial Surveys Collection and the Nirenstein National Reality Company Collection. Many World War II era maps filed in the general collections are in the form of photomaps because they could be produced rapidly by tactical mapping units in the field to support military actions on the ground and for the identification of bombing targets.
http://www.loc.gov/rr/geogmap/guide/gmillapa.html - Library of Congress
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