Y gwahaniaeth rhwng diwygiadau o "Cytgord Ewrop"

Lleihawyd o 12 beit ,  8 o flynyddoedd yn ôl
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==Ffynonellau==
* Bridge, F. R. a Bullen, Roger (1980) ''The Great Powers and the European States System 1815–19141815–1914''. Llundain: Longman.
* Lowe, John (1988) ''Rivalry and Accord: International Relations 1870–19141870–1914''. Llundain: Hodder & Stoughton.
* Lowe, John (1990) ''The Concert of Europe: International Relations 1814–701814–70''. Llundain: Hodder & Stoughton.
* Seaman, L. C. B. (1988) ''From Vienna to Versailles''. Caergrawnt: Routledge.
 
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