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1499 documents found.
Published:
| Meyer, E. Jacobi, E. & Stiefel, E.C.
Published:
| Shepard, R.N.
Published:
| Shepard, R.N.
Published:
| -
Published:
| Schumacher, R.O.
Published:
| Festinger, L.
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| Centraal bureau voor de Statistiek, hoofdafdeling statistieken van verkeer en vervoer
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| Beebe-Center, J.G.