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author_ss:"Werf-Davelaar, T.v.d."
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theme_ss:"Formalerschließung"
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Werf-Davelaar, T.v.d.: ¬De bibliografische beschrijving van elektronische informatiebronnen : de ontwikkeling van ISBD(ER) (1997)
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Werf-Davelaar, T.v.d.: ¬De bibliografische beschrijving van elektronische informatiebronnen : 2 (1997)
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