The spiral structure of our galaxy  proceedings of the International Astronomical Union symposium No.38 held in Basel, Switzerland, August 29-September 4, 1969 
edited by W. Becker                                                     
 - Dordrecht  D. Reidel Publishing  1970 
 - xiii, 478p. 
 - IAU Symposium; no. 38 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy and Astrophysics Thesaurus<br/>Milky way galaxy<br/>Spiral galaxies
<br/><br/><label>Universal Decimal Class. No.: </label>082.2:52  / IAU-S38