"The object of this study is to prepare, for purposes of standardization, a list of signs and symbols used in the interpretation of aerial photographs, and to consider the use of annotation symbols printed on gummed acetate in photographic interpretation." Digitized by www.dtic.mil, Cover title, "28 September 1944.", "The object of this study is to prepare, for purposes of standardization, a list of signs and symbols used in the interpretation of aerial photographs, and to consider the use of annotation symbols printed on gummed acetate in photographic interpretation."--Page 1, Letter of clearance for public release inserted, Photocopy