"The spiral structure of our galaxy : International Astronomical Union, Symposium No. 38, held in Basel, Switzerland, 29 August - 4 September 1969 ; [50th anniversary of the IAU 1919-1969]"
"The spiral structure of our galaxy : International Astronomical Union symposium no. 38 held in Basel, August 29 - September 4, 1969"
"The Spiral structure of our galaxy : [proceedings]"@en
"The spiral structure of our Galaxy International Astronomical Union Symposium No. 38, held in Basel, August 29 - September 4, 1969"
"The spiral structure of our galaxy : symposium n. 38, held in Basel, Switzerland, August 29 - September 4, 1969"
International Astronomical Union. (38 : 1969 : Basel)
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Union astronomique internationale. (38 ; 1969 ; Basel)
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