The Outer Galaxy [E-Book] : Proceedings of a Symposium Held in Honor of Frank J. Kerr at the University of Maryland, College Park, May 28–29, 1987 /  

Blitz, Leo
1988

Unsolved Problems of the Milky Way [E-Book] : Proceedings of the 169th Symposium of the International Astronomical Union, held in the Hague, the Netherlands, August 23–29, 1994 /  

Blitz, Leo
1996