00874nam a2200205Ia 4500003000900000008004100009040001600050080002300066110003700089111009100126245023700217260005300454300001500507490002700522650001500549700002500564700002800589700002200617700002900639IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a082.8:52bIAU-C180  aInternational Astronomical Union  aInternational Astronomical Union Colloquiumn180thcWashington, D. C.d2000 Mar. 27-30 0aTowards models and constants for sub - microarcsecond astrometrybproceedings of 180th IAU colloquium held in Washington, D. C., U.S.A., March 27-30, 2000cedited by K. J. Johnston…[et al.]                                           aWashington, D. C.bU. S. Naval Observatoryc2000  axix, 427p.  aIAU Colloquium; no.180  aAstrometry  aJohnston, K. J., ed.  aKaplan, George H., ed.,  aLuzum, Brain, ed.  aMcCarthy, Dennis D., ed.