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4Published 1982“…Bonn: CRSVI…”
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6Published 1973“…Bonn: CEEP…”
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7Published [s.a.]“…[Bonn]: [Inter Nationes]…”
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8“…Bonn: Die Falken…”
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12Published 1980“…Bonn: Friedrich-Ebert-Stiftung…”
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14Published 1975-1980“…Düsseldorf: DGB; Bonn: FES…”
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15