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- Subject is exactly "Air mail service--United States--Handbooks, manuals, etc."
Rules and instructions for government of pilots, mechanics and riggers.
Date for this item was determined by a Dahlberg research volunteer to be 1918. His source was "Mavericks of the Sky: the first daring pilots of the U.S. Air Mail" by Barry Rosenberg, and Catherine Macaulay. Notes on top of page 282.