US Air Services, publisher: Air Service Publishing Co, Inc, Washington, In english, 1926, 1927, 1929, 1930, 1931, 1933, 1934, 1935, 1937, 1938. The listing price of $99 is for a single issue of the periodical. Several issues are available during the period indicated in the listing title. Please inquire about availability of specific issues, id3-009382