Slavery in the Sudan in history.
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D000352:Africa, Northern / Q000208:ethnology; D004467:Economics / Q000266:history / Q000331:legislation & jurisprudence; D005006:Ethnicity / Q000193:education / Q000208:ethnology / Q000266:history / Q000331:legislation & jurisprudence / Q000523:psychology; D005843:Geography / Q000191:economics / Q000193:education / Q000266:history / Q000331:legislation & jurisprudence; D049668:History, 15th Century; D049669:History, 16th Century; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D049690:History, Ancient; D049691:History, Medieval; D006801:Humans; D012067:Religion / Q000266:history; D012637:Security Measures / Q000191:economics / Q000266:history / Q000331:legislation & jurisprudence; D011049:Social Control Policies / Q000191:economics / Q000266:history / Q000331:legislation & jurisprudence; D012940:Social Problems / Q000191:economics / Q000208:ethnology / Q000266:history / Q000331:legislation & jurisprudence / Q000523:psychology; D013397:Sudan / Q000208:ethnology