00293nam a2200109Ia 4500008004100000041000800041084001300049245004200062260003600104653001800140700002500158160808s1951    xx            000 0 eng d  aeng  aB9:62CC  aAstrophysics /cedited by J. A. Hynek  aNew York :bMcGraw-Hill,c1951.  aAstro Physics  aHynek, J. A.eeditor