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- Woerden, Hugo van (5)
- International Astronomical Union. Symposium (2)
- Allen, Ronald J. (1)
- Blaauw, Adriaan (1)
- Boland, Wilfried, 1953- (1)
- Brouw, Willem N., 1940- (1)
- Burton, W. B. (William Butler), 1940- (1)
- Hulst, H. C. van de (Hendrik Christoffel van de) 1918- (1)
- International Astronomical Union (1)
- International Astronomical Union. Commission 34 (1)
- International Scientific Radio Union (1)
- Oort, Jan Hendrik (1)