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6Published (Ca. 1997)Subjects: “…[Environmental policy.]…”
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9Subjects: “…environmental policy…”
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11Subjects: “…environmental policy…”
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13Published 1986Subjects: “…environmental policy…”
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15Subjects: “…environmental policy…”
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16by Meerendonk, Ben vanSubjects: “…[Environment protection., Environmental policy.]…”
Published 1947, 1 september
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20by Peter Hardi ; with a contribution by Werner Weidenfeld.Subjects: “…[Environmental policy, Environmental protection]…”
Published c1994.