Otto Gerhard Heldring :
| Institution: | International Institute of Social History |
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| Format: | TEXT |
| Published: |
Amsterdam,
1942.
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10622/D950965E-8BE0-4973-84B5-66091626BCA0 |
| Published: | 1942. |
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