TY  - BOOK
T1  - Forecasting civil aviation activity methods and approaches.
T2  - Transportation Research Circular
LA  - English
PP  - Washington, D.C.
PB  - Transportation Research Board, National Research Council
YR  - 1991
UL  - https://tuklas.up.edu.ph/Record/UP-99796217610382390
NO  - Cover title.
NO  - June 1991.
KW  - Aeronautics, Commercial : United States : Forecasting.
KW  - Air travel : Forcasting.
ER  -