Washington, D.C. U.S. Government Printing Office, 1942.
Softcover. Later edition. Small quarto. Stapled wrappers. 74pp. Contains black and white illustrations and a fold-out map. Near fine with faint toning along the extremities and a tiny abrasion on the front wrap. U.S. Department of Commerce, Civil Aeronautics Administration - Civil Aeronautics Bulletin No. 22.