Co-ordination of Galactic Research : International Astronomical Union Symposium No.1 - Held at Groningen, 22–27 June 1953 Blaauw, A. 9781316612705 Heftet 14.07.2016 Engelsk Midlertidig utsolgt
Second Conference on Co-ordination of Galactic Research : International Astronomical Union Symposium No.7 - Held at Saltsjobaden Near Stockholm, June 1957 Blaauw, A. Roman, N. G. Weaver, H. F. Larsson-Leander, G. Sandage, A. Thackeray, A. D. 9781316612620 Heftet 14.07.2016 Engelsk Midlertidig utsolgt
