Proper Motions of H2O Masers in W49(N) and the Distance to the Galactic Center Gwinn, C. R. ; Moran, J. M. ; Reid, M. J. ; Schneps, M. H. ; Genzel, R. ; Downes, D. Abstract Publication: The Center of the Galaxy Pub Date: 1989 Bibcode: 1989IAUS..136...47G