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Obstruction marking manual /
U.S. Department of Commerce, Civil Aeronautics Administration.

APA Citation

United States. Civil Aeronautics Administration. (1941). Obstruction marking manual. Washington, D.C.: Civil Aeronautics Administration.

MLA Citation

United States. Civil Aeronautics Administration. Obstruction Marking Manual. Washington, D.C.: Civil Aeronautics Administration, 1941.

Warning: These citations may not always be complete (especially for serials).