en.wikipedia.org
en.wikipedia.org
britannica.com
en.wikipedia.org
historyworld.net
history.howstuffworks.com
en.wikipedia.org
jstor.org
odysseytraveller.com
britannica.com
library.fes.de
Bibliothek der Friedrich-Ebert-Stiftung
https://library.fes.de › libalt › journals › swetsfulltext › 9804006.pdf
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