00705nam a2200205Ia 4500003000900000008004100009020001800050040001600068080001500084100002600099245009100125260004800216300001500264650003400279650004100313650003200354942000700386999001500393952009100408IN-BaIIA211028s9999    xx            000 0 eng d  a0-521-33907-3  cIIA Library  a520.8bWAL  aWalker, Gordon915202 0aAstronomical observationscGordon Walker                                                aCambridgebCambridge University Pressc1987  axii, 347p.  aAstronomical techniques91786  aAstronomy and astrophysics thesaurus  aOptical observations915203  cBK  c9041d9041  00104070aBANbBANcGENd1987-06-04l0o520.8/ WALp9937r2021-11-05w1987-06-04yBK