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modern europe america usa africa south sources statistics c18th c17th c19th slavery slaves slave trade

medieval europe france sources documents primary c16th letters modern ancient c20th c17th c18th c19th c15th manuscripts images espanol

medieval modern asia japan sources documents images primary c20th c19th c18th c17th manuscipts science meiji tokugawa feudalism

medieval modern europe britain england uk sources documents images primary scotland wales c19th c18th c17th c15th c14th c16th c13th c12th

usa america modern c17th c18th c19th c20th sources primary wwi wwii depression maps images