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| PIARC
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| PIARC
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| PIARC
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| PIARC
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| PIARC
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| PIARC
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| Centraal Bureau voor de Statistiek CBS
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| Centraal Bureau voor de Statistiek CBS Voorburg/Heerlen
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| Harders, J.
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| Federal Highway Administration FHWA, Bureau of Public Roads