. . . "The structure and content of the galaxy and galactic gamma rays"@en . "The structure and content of the galaxy and galactic gamma rays" . . . . "The Structure and content of the galaxy and galactic gamma rays : June 1976, Goddard Space Flight Center, Greenbelt, Maryland"@en . . . . . . . . . "The structure and content of the galaxy and galactic gamma rays : the proceedings of an international symposium held at Goddard Space Flight Center, Greenbelt, Maryland, June 2-4, 1976" . . . . "The structure and content of the galaxy and galactic gamma rays : the proceedings of an international symposium held at NASA's Goddard Space Flight Center, Greenbelt, Maryland, June 2-4, 1976 : preprints"@en . . "The structure and content of the galaxy and galactic gamma rays : the proceedings of an international symposium held at NASA's Goddard Space Flight Center, Greenbelt, Maryland, June 2-4, 1976"@en . . . . "Conference papers and proceedings"@en . . . . . . . "The Structure and content of the galaxy and galactic gamma rays : the proceedings of an international symposium held at NASA's Goddard Space Flight Center, Greenbelt, Maryland, June 2-4, 1976"@en . . . . . "International Gamma-Ray Symposium (3rd : 1976 : Goddard Space Flight Center, Md.)" . . . "International Gamma-Ray Symposium (2nd : 1976 : Goddard Space Flight Center)" . . . "International Gamma-Ray Symposium (2nd : Goddard Space Flight Center)" . . . "International Gamma-Ray Symposium (2 : 02-06-1976 - 04-06-1976 : Greenbelt, Md.)" . . . . .