The mainspring of human progress
| Institution: | International Institute of Social History |
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| Format: | TEXT |
| Published: |
Irvington-on-Hudson,
1953.
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/35152CA9-0A11-4E90-A2C4-ED4B2904385D |
| Published: | 1953. |
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