1
2
Được phát hành: 1979
Superior document: Science and technology and the future proceedings and joint report of World Future Studies Conference and DSE-Preconference held in Berlin (West) 4. -10. May 1979 2
3
Được phát hành: 1979
Superior document: Science and technology and the future proceedings and joint report of World Future Studies Conference and DSE-Preconference held in Berlin (West) 4. -10. May 1979 1