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12 Subjects: “...Menschliche Natur...”

13 Subjects: “...thema EDItEUR::W Lifestyle, Hobbies and Leisure::WN Nature and the natural world: general interest...”

14 “...Observations on the nature of civil liberty, the principles of government, and the justice...”

15 Subjects: “...nature...”

16 Subjects: “...nature...”

17 Subjects: “...nature...”

18 Subjects: “...natural gas...”

19 Subjects: “...natural gas...”

20 Subjects: “...natural rubber...”