De snelheids-"trappen" van vergelijking
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| Institution: | International Institute of Social History |
| Format: | IMAGE |
| Published: |
1926, 12 juni
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| Online Access: | http://hdl.handle.net/10622/9A9281B6-1165-4E0C-8903-4CD91437C72A |
| Published: | 1926, 12 juni |
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