Normal 500 mb charts for the Northern Hemisphere; annual, seasonal, and monthly, with monthly standard deviations - Bryson, Reid A. (Madison, U.S. Navy Weather Research Facility, 1958)
"ASTIA No. AD-152531."
Research sponsored by the Geophysics Research Directorate of the Air Force Cambridge Research Center, Air Research and Development Command, under Contract no. AF19 (604)-922.
Errata slip inserted.
Keywords: Atmospheric pressure -- Maps