The following databases and library catalogues available free on the Internet provide thousands of conservation references, including the conservation of mosaics. References may also include abstracts.
Some host institutions offer a photocopy service, subject to international copyright restrictions.
The Conservation Information Network (CIN)
http://www.bcin.ca/
ICCROM Library Catalogue
http://biblio.iccrom.org/
Art and Archaeology Technical Abstracts (Getty Conservation Institute)
http://aata.getty.edu
ICOMOS Documentation Centre Catalogue
http://www.icomos.org/en/documentation-center