Estec, Noordwijk
D. E. Page
Observatoire de Paris, Meudon
M. Pick
Astronomical Institute, Bratislava
L. Kresák
Utrecht State University Faculty of Law, Utrecht
G. C. M. Reijnen & Gijsbertha C. M. Reijnen
Harvard College Obs., Cambridge, Massachusetts
A. G. W. Cameron
Royal Netherlands Meteorological Institute De Bilt, The Netherlands
Cornelius J. E. Schuurmans
Inst. of Applied Mathematics, Moscow
Mikhail Ya Marov
Smithsonian Institution, Rockville
B. Goldberg
Department of Physics, University of Sheffield, Sheffield
T. R. Kaiser
Institute for Space Aeronomy, Brussels
J. Lemaire
Astronomical Institute, Ondřejov
L. Sehnal & B. Valniček
Max-Planck Institute for Astronomy, Heidelberg
H. Elsässer
Astronomical Institute at Utrecht, Utrecht
W. de Graaff, A. C. De Landtsheer & C. de Jager
Astrophysical Observatory, Firenze
Franco Pacini
Astronomical Institute, Bochum
K. Rohlfs
Institute for Theoretical Astronomy USSR Academy of Sciences, USSR
I. D. Zhongolovich
Max-Planck-Institut für Radioastronomie, Heidelberg
A. Greve
Czechoslovak Academy of Sciences Astronomical Institute, Prague
J. Ruprecht
Astronomy Centre, Univ. of Sussex, Germany
R. J. Tayler
Institute for Space Aeronomy, Brussels
G. Kockarts
Max-Planck-Institute for Aeronomy, Lindau
W. I. Axford
Scientific Research Foundation, Jerusalem
H. Tabor
University of Innsbruck, Innsbruck
H. J. Bolle
Lab. for Solid State Physics, Zürich
E. Kaldis
Astrophysical Institute, University of Brussels, Brussels
C. de Loore
Astronomical Institute, Ondřejov, Czechoslovakia
J. Kleczek
Royal Greenwich Observatory, Hailsham
C. A. Murray
Astronomical Observatory Uppsala, Sweden
Åke Wallenquist