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Symposium on the Spiral Structure of Our Galaxy, University of Basel, 1969.
The spiral structure of our galaxy / edited by W. Becker and G. Contopoulos.
Galaxies -- Congresses.
Milky Way -- Congresses.
Becker, Wilhelm, 1907-1996 ed.
Contopoulos, George, 1928-
UniversittĖƒ Basel.
International Astronomical Union.
Catalog