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Intern. astronomical union. Sympos. N 31. Organized by the IAU in co-operation with URSI held at Noordwijk, the Netherlands, 25 aug.-1 sep. 1966. Radio astronomy and the galactic system. Ed.by Hugo van Woerden
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Intern. astronomical union. Sympos. N 31. Organized by the IAU in co-operation with URSI held at Noordwijk, the Netherlands, 25 aug.-1 sep. 1966. Radio astronomy and the galactic system. Ed.by Hugo van Woerden
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