TY  - BOOK
ED  - United States.
TI  - Modifications to ground facilities, systems, & equipment in the natl. airspace system
PY  - 1977///]
CY  - [Washington, D.C.
KW  - Air traffic control
KW  - United States
KW  - Data processing
N1  - 12/27/77; CRDP Program Historic Shelflist record
ER  -