Letter re: Airports Advisory Committee
Betsworth, Walter E.
1950-10-26
TCU
Letter re: American Association of Airport Executives
1952-03-28
1955-01-06
1950-06-16
1951-04-17
Letter re: Waterloo Municipal Airport
1951-05-24
1951-05-03
Letter re: Associates of Airport Executives meeting
1951-11-06