- A Universal Construction for Groups Acting Freely on Real Trees
- Weak Interactions: Invited Papers presented at the second international Summer School for Theoretical Physics University of Karlsruhe (July 14 – August 1, 1969)
- Astrophysics
- Nuclear Physics
- Symposium on Meson-, Photo-, and Electroproduction at Low and Intermediate Energies: Bonn, September 21-26, 1970