Problem families :
| Institution: | International Institute of Social History |
|---|---|
| Format: | TEXT |
| Published: |
London,
1952.
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/409900D2-534E-4A99-BBA9-55E11D1A7873 |
| Published: | 1952. |
|---|