00457nam a2200145Ia 4500003000900000008004100009040001600050080001200066245010200078260004400180300000900224650004100233650001300274700002400287IN-BaIIA211028s9999    xx            000 0 eng d  cIIA Library  a31bARM 0aBritannica book of the year 1961cedited by John Armitage                                          aChicagobEncyclopaedia Britannicac1961  a564p  aAstronomy and Astrophysics Thesaurus  aYearbook  aArmitage, John, ed.