EC Library Guide on the history of the European Commission: Websites and Portals

CVCE.eu | University of Luxembourg
The University of Luxembourg’s CVCE.eu research infrastructure gives you access to thousands of documents and publications on the European integration process.
It is a major information source.
Archives Portal Europe
The Archives Portal Europe provides access to information on archival material from different European countries as well as information on archival institutions throughout the continent.
Europeana
Europeana gives access to millions of cultural heritage items from institutions across Europe.