TY  - BOOK
AU  - Frederick,John H.
TI  - Commercial air transportation
U1  - 387.7 FRE 
PY  - 1961///.
CY  - Homewood : 
PB  - Richard D. Irwin, Inc., 
KW  - Aeronautics, Commercial
KW  - United States
KW  - Transport aircraft
ER  -