Washington, D.C., Mar. 13. H.C. Yates with the process printing frame printing direct from negative to metal plate. At the geological survey

Geological Survey. Washington, D.C., Mar. 13. Lithographic draftsmen correcting the printing plates at the Dept. of Interior Geological Survey Section

Geological Survey. Washington, D.C., Mar. 13. The offset camera making and copying maps, charts, and diagrams. This is used to change the size and makes the different plates for the different colors used on the maps

Making prints for $3,000,000 map. Grover M. Plew, AAA laboratory worker, making the finished photographic prints which go into the finished map now being put together by the AAA. Approximately one-third of the entire land surface of the United States is being photographed from the air for the map. 7

Geological Survey, Dept. Interior. Washington, D.C., Mar. 13. E.A. Shuster working with the erocartograph constructing topographies from airplane pictures

National Archives. Washington, D.C., Nov. 22. In the powerful press, the sheets of acetate, under heat and pressure 'melt' into the pores of the paper and adhere to each other as well. One additional advantage of this process is that, after being pressed with the sheets of cellulose acetate, the pap

Geological Survey, Interior Dept. Washington, D.C., Mar. 13. Horace Johnson engraving one of the copper plates that is used for a topographical map

Press room where all maps and charts are printed for the Coast and Geodetic Survey

Geological Survey. Washington, D.C., March 13. Albert Pike using a stereoscope on a pair of photographs to bring out the relief and locate objects for a map