Fort Wolters (Tex). United States Army Primary Helicopter School. Training Material Division. This booklet gives an overview of air masses as they relate to aviation; according to the scope notes on the title page, it includes an "Explanation of the classification of air masses; weather associated with particular air masses; [and the] trajectory and source region of air masses that invade the United States." The text also has self-evaluation questions printed throughout, with the answers printed on the last page. iii, 12 p. : ill., maps ; 27 cm. eng text text_book Snyder, Henry W. mod-tim 1971-02 1971-02 Air Masses Programed Text AM-32-B, February 1971 oclc: 276778038 Meteorology in aeronautics--United States. Flight training--United States. Air masses. Fort Wolters (Tex.) Military and War - Transportation - Aviation Military and War - Forts Business, Economics and Finance - Transportation - Aviation maritime air masses continental air masses clouds weather ark: ark:/67531/metapth46578 http://texashistory.unt.edu/ark:/67531/metapth46578/