00515nam a2200157Ia 4500003000900000008004100009020001800050040001600068080002500084110004500109245010800154260005000262300001400312650001400326650001700340IN-BaIIA211028s9999    xx            000 0 eng d  a0-309-03249-0  cIIA Library  a52(047)"1980"bNRC-1  aUnited States. National Research Council 0aAstronomy and astrophysics for the 1980'scNational Research Council                                     aWashington, D CbNational Academy Pressc1982  axx, 189p.  aAstronomy  aAstrophysics