00846nam a2200229Ia 4500003000900000008004100009020001800050040001600068080002200084110003700106111008400143245014500227260004200372300001300414490002600427650004100453650002400494650002000518700001900538700002200557710003700579IN-BaIIA211028s9999    xx            000 0 eng d  a90-277-0303-5  cIIA Library  a082.2:52bIAU-S55  aInternational Astronomical Union  aInternational Astronomical Union Symposiumn55thcMadrid, Spaind1972 May 11-13 0aX- and gamma-ray astronomybproceedings of the IAU symposium No.55 held in Madrid, Spain, 11-13 May 1972cedited by H. Bradt and R. Giacconi  aDordrechtbD. Reidel Publishingc1973  ax, 323p.  aIAU Symposium; no. 55  aAstronomy and Astrophysics Thesaurus  aGamma ray astronomy  aX-ray astronomy  aBradt, H., ed.  aGiacconi, R., ed.  aInternational Astronomical Union