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1 C-3   December 22, 1941

Pittsburgh Communication Station will keep the Pittsburgh Airway Traffic Control Center fully informed regarding the teletype warnings and "all clears".

Herbery DePue
Superintendent of Airways 

Copies: All Airway Communication Stations, First Region (2)
Army Information Centers New York (5)
C.A.A., Washington (5)
All C.A.A. Regional Managers (3) 
War Department, Navy Department, Weather Bureau Stations, First Region (2)
Toronto (2) 
Montreal (2)