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1Published 1982Subjects: “…steenkoolmijnen…”
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3Published [s.a.]Subjects: “…steenkoolmijnen…”
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4Subjects: “…steenkoolmijnen…”
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7Subjects: “…steenkoolmijnen…”
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11Published 1954Subjects: “…steenkoolmijnen…”
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13Published 1986Subjects: “…steenkoolmijnen…”
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14Published 1925Subjects: “…steenkoolmijnen…”
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15Published [1985]Subjects: “…steenkoolmijnen…”
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17Published 1956Subjects: “…steenkoolmijnen…”
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