000 00287nam a2200121Ia 4500
008 190711s9999 xx 000 0 und d
082 _a521.1 R988
100 _aRYABOV,Y
245 0 _aCELESTIAL MECHANICS
260 _aMOSCOW
_bF.L. PUB HOUSE
_c1959
300 _a20X13
942 _cBK
_2DDC
999 _c11864
_d11864