"September 1940" stated on front cover; Civil Aeronautics Bulletin No. 25; U.S. Department of Commerce, Civil Aeronautics Administration, Washington, D.C.; softbound with many foldout maps and diagrams; good condition with minor edgewear and unmarked pages; boards have some minor wear/edgewear.
 
from Preface -
This book has been specially prepared for use as the meteorology text in the preliminary ground course of the Civilian Pilot Training Program...Many texts have been published recently on aeronautical meteorology, but most of these were not designed primarily for the pilot...