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The Europa website provides an overview of the Treaty on European Union (the Maastricht Treaty):
https://www.europarl.europa.eu/about-parliament/en/in-the-past/the-parliament-and-the-treaties/maastricht-treaty
The Europa website provides an overview of economic and monetary union:
https://ec.europa.eu/info/business-economy-euro/economic-and-fiscal-policy-coordination/economic-and-monetary-union_en
The Europa website provides an overview of the Treaty of Amsterdam:
https://www.europarl.europa.eu/about-parliament/en/in-the-past/the-parliament-and-the-treaties/treaty-of-amsterdam
The Presidency conclusions of the Amsterdam European Council meeting of June 1997 discuss the conclusions of the IGC that agreed the text of the Treaty of Amsterdam. The conclusions can be found at:
www.consilium.europa.eu/ueDocs/cms_Data/docs/pressData/en/ec/032a0006.htm