00586nam a2200181Ia 4500003000900000008004100009040001600050080001500066100002000081245005400101260003900155300001000194650004100204650002400245942000700269999001500276952011300291IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a521.1bRYA  aRyabov, Y95691 3aAn elementary of celestial mechanicscRyabov, Y    aNew YorkbDover Publicationsc1959  a164p.  aAstronomy and astrophysics thesaurus  aCelestial mechanics  cBK  c3205d3205  00104070aBANbBANcGENd1969-03-03g9.00l0o521.1/ RYAp3560r2021-11-05v9.00w1969-03-03yBKGRs. 9.00