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Associazioni, enti, istituti, università, organizzazioni, . . . .
- American Ass. of Variable Stars
- American Astronomical Society
- Ass. of Lunar & Planetary Observ.
- Astronomical League
- Astronomical Society Australia
- Astronomical Society of the Pacific
- Astronomy Ireland
- A.S.U. Physics & Astronomy
- British Astronomical Association
- Cambridge Institute of Astronomy
- Center Astroph. & Space Sciences
- Center for Astrophysics Harvard
- Central Bureau Astron. Telegrams
- Columbia Un. Astron.&Astrophysics
- Dip. di astronomia Univ. Bologna
- Dip. di astronomia Univ. Firenze
- Dip. di astronomia Univ. Padova
- Earth Science Directorate
- European Astronomical Society
- Geological and Planetary Science
- Goddard Institute for Space Studies
- Harvard University Dep. Astronomy
- Herzberg Inst. of Astrophysics
- High Energy Astroph. Science . . .
- Hubble Space Telescope Project
- Hubble Space Telescope STSCI
- Indiana University Astronomy Dep.
- Institut d'Astrophysique Spatiale
- Institute for Astronomy Un. Hawaii
- Instituto De Astrofisica de Canarias
- International Astronomical Union
- International Dark-Sky Association
- Instituto de Astronomia Un. Mexico
- Istituto di Radioastronomia
- Istituto Tecnico Nautico Artiglio
- Lunar and Planetary Institute
- Max Planck Institut fur Astronomy
- Meteoritical Society
- Misao Project Home
- Museo de la Ciencia y el Cosmos
- National Air and Space Museum
- National Space Centre
- Orpington Astronomical Society
- Planetary Science Institute
- Plan. Science Research Discov.
- Planetary Society
- Royal Astronomical Society
- Royal Astronomical Society Canada
- S.E.T.I.
- Smithsonian Astroph. Observatory
- Sociedad Española de Astronomía
- Société Astronomique de France
- Society for Popular Astronomy
- Solar Data Analysis Center
- Southern Cross Astronom. Society
- Space Environment Center NOAA
- S.E.D.S.
- Unione Astrofili Italiani
- Univ. Winsconsin Dep. Astronomy
- Yale University Dep. Astronomy
