Under the direction of Edward Steichen the U.S. Air Force developed techniques for aerial reconnaissance in WWI. These are vintage examples of this work, from 1918 (one 1919.). There are 6 - 7" x 9" original prints with marginal notations of coordinates, locations and other information, plus a 7" x 8" print of a landscape with specific locations given in the negative. This system of coordinates must have been part of the process developed by Steichen for maximum effective use of the photographs. There is a 6 ยข" x 7" "Assemblage of Aerial Photographs from the 111th Corps Air Service, 1st Aero Squadron Demonstration Center in Germany." 10- 6 3/8" x 8" photographs are vintage copy prints of various scenes including ruined and intact cities, fields with coordinates of positions, etc. Of the two additional prints it is interesting that one is a nice street view of Mersch, Luxembourg, with a banner "For our Deliverers," titled "Luxembourg welcomes the Americans." Steichen was born in Luxembourg and his loyalty to his country of origin was part of his motivation for serving in the war. 20 photographs in all.