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Keywords: First Transcontinental US Air Mail under Contract 1927.jpg Cover carried from San Francisco to Chicago on the first Transcontinental US Air Mail under Contract July 1 1927 PD-USGov Original upload log page en wikipedia First_Transcontinental_US_Air_Mail_under_Contract_1927 jpg 2011-09-25 06 58 Centpacrr 1188×701× 1126424 bytes <nowiki>Cover carried from San Francisco to Chicago on the first Transcontinental US Air Mail under Contract July 1 1927</nowiki> Boeing 40 |