British Library http://www.bl.uk/
COPAC http://www.copac.ac.uk/
Tate Gallery http://www.tate.org.uk/research/
Google Scholar http://scholar.google.com/
OIAster http://oaister.umdl.umich.edu/o/oaister/
Getty vocabularies http://www.getty.edu/research/conducting_research/vocabularies/
Voice of the Shuttle http://vos.ucsb.edu/
Papers of Surrealism http://www.surrealismcentre.ac.uk/publications/papers/
Artists Papers Register http://www.apr.ac.uk/artists/home.htm
UbuWeb http://www.ubu.com/
Luxonline http://www.luxonline.org.uk
International Dada Archive, University of Iowa http://www.lib.uiowa.edu/dada/index.html
Bill Douglas Centre for the History of Cinema and Popular Culture, University of Exeter http://www.centres.ex.ac.uk/bill.douglas/