TY  - BOOK
AU  - Vorontsov-Vel'yaminov B.A
AU  -  Beer Arthur Ed.
AU  -  Hutchings John B Ed.
TI  - Astronomical Problems : An introductory course in astronomy
U1  - B9, K9 
PY  - 1969///
CY  - Oxford
PB  - Pergamon press        
N1  - Appendix(p
ER  -