Proceedings of the 20th World Congress :
| Institution: | International Institute of Social History |
|---|---|
| Format: | TEXT |
| Published: |
PTTI,
1969.
Geneva : |
| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/3C621F03-8D5E-44BF-820D-8111C71A0339 |
| Published: | 1969. |
|---|