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- Ruijgrok, G.J.J. (author) report 1978
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- Van Paassen, D.M. (author), Ruijgrok, G.J.J. (author) report 1977
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Ruijgrok, E.C.M. (author), Bel, D.J.F. (author)De waarde van de te beschermen imponderabilia exclusief slachtoffers kan geraamd worden op circa 9 procent van de waarde van de ponderabilia. Inclusief slachtoffers is dat circa 22 procent. Deze getallen omvatten alleen de waarde van natuur, archeologie, landschap, historische bouwkunde en (drink)waterkwaliteit. Om het risico ten aanzien van...report 2008
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- Ruijgrok, G.J.J. (author) report 1982
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1999
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- Ruijgrok, G.J.J. (author) report 1981
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- Van Paassen, D.M. (author), Ruijgrok, G.J.J. (author) report 1978
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1996
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- Van Deventer, F.W.J. (author), Ruijgrok, G.J.J. (author), Vermeulen, C. (author) report 1976
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1988
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- Ruijgrok, G.J.J. (author) report 1980
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1999
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- Ruijgrok, G.J.J. (author) report 1975
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- Ruijgrok, G.J.J. (author), Wakker, K.F. (author) report 1977
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1990
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- Ruijgrok, G.J.J. (author) report 1976
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- Ruijgrok, G.J.J. (author) report 1984
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1987
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- Feenstra, J. (author), Ruijgrok, G.J.J. (author) report 1971
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- Ruijgrok, G.J.J. (author), van Paassen, D.M. (author) report 1985
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