Pyramide
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- ↑ Paul Otlet, Traité de documentation: le livre sur le livre, théorie et pratique (Bruxelles: Editiones Mundaneum, 1934), 420.
- ↑ Paul Otlet, Traité de documentation: le livre sur le livre, théorie et pratique (Bruxelles: Editiones Mundaneum, 1934).
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