The Spiral Structure of Our Galaxy: International Astronomical Union/Union Astronomique Internationale Symposium No. 38, Held in Basel, Switzerland, August 29 - September 4, 1969
Illus. with photos & charts. Dordrecht-Holland & New York: D. Reidel Publishing Company/Springer-Verlag New York Inc., 1970. Small 4to. Cloth. xiii, 478 p. 1st ed. Fine in near fine d. w.