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Observa Prøvevalg 1976 ... : Observa Political Index Polls, 1976 ...
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Observa. - : Danish Data Archive, 1991
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BASE
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Observa Prøvevalg 1978, april-undersøgelsen ... : Observa Political Index Polls 1978: April ...
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Observa. - : Danish Data Archive, 1991
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BASE
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Observa Prøvevalg 1981, juni-undersøgelsen ... : Observa Political Index Polls 1981: June ...
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Observa. - : Danish Data Archive, 1990
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BASE
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