TY  - BOOK
AU  - Porter,J.G.
TI  - Catalogue of Cometary Orbits 1960: EQUINOX 1950.0 
U1  - B1102C31f399 
PY  - 0000///196o
CY  - London
PB  - British Astronomical Association
KW  - Astronomy
KW  - Cometary Orbits-Catalogue
ER  -