TY - BOOK AU - Bradt,Hale AU - Giacconi,Riccardo TI - X- and gamma-ray astronomy SN - 9027703035 U1 - 523.0197222 PY - 1973/// CY - Dordrecht, Holland, Boston PB - D. Reidel KW - X-ray astronomy KW - Congresses KW - Gamma-Ray Astronomy N1 - "Symposium no. 55 held in Madrid, Spain, 11-13 May 1972."; Sponsored by the International Astronomical Union ER -