000 00283pam a2200109a 44500
082 _a520.6
_bIN8 V.15
100 _aInternational Astronomical Union
245 1 _aPROBLEMS OF EXTRA-GALACTIC RESEARCH
260 _a
_bThe Macmillan Company
_c1962
964 _gCIRC
997 _a52111 C
999 _c412730
_d412730