TY  - BOOK
ED  - United States. Government Printing Office
TI  - The astronomical almanac for the year 1991
SN  - 0-11-886938-8
PY  - 1990///
CY  - Washington
PB  - U. S. Government Printing Office
KW  - Almanacs
KW  - Ephemerides
KW  - NASA
ER  -