00631nam a2200193Ia 4500003000900000008004100009040001600050080001500066100002900081245007100110260005500181300000800236650002100244650004100265650002100306942000700327999001300334952009000347IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a521.9bVAR  aVarnum, William B.91235 0aDifferential refraction in positional astronomycWilliam B. Varnum  aNew YorkbCarnegie Institution of Washingtonc1922  a50p  aAstrometry91236  aAstronomy and Astrophysics thesaurus  aRefraction91237  cBK  c550d550  00104070aBANbKODcGENd0000-00-00l0o521.9/ VARp569r2021-11-05w0000-00-00yBK