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ancient medieval modern europe sources secondary sources c20th c19th wikibooks wikis
ancient medieval modern europe america asia africa greece rome egypt britain germany usa china sources secondary sources textbooks wikibooks books wikis
11 ancient history egypt
11 ancient history mesopotamia sumer akkad assyria babylon
11 ancient history mesoamerica maya aztecs inca olmecs
11 ancient history greece
ancient history research sources primary sources
vietnam war
11 modern history vietnam war
history resources sources education books online