Links from the Second Edition of the Handbook.  I’m going to replace these with the links from the forthcoming Third Edition very soon!

Union catalogues

• WorldCat, www.worldcat.org.
• COPAC, http://copac.jisc.ac.uk.
• Karlsrüher Virtueller Katalog (KVK), www.ubka.uni-karlsruhe.de/kvk_en.html.
• SUNCAT, www.suncat.ac.uk.

Archive gateways

• Archives Hub, archiveshub.ac.uk.
• Discovery, http://discovery.nationalarchives.gov.uk.
• Archive Grid, https://beta.worldcat.org/archivegrid.
• Archives Portal Europe, www.archivesportaleurope.net.

Catalogues of incunabula

• Incunabula Short Title Catalogue (ISTC), www.bl.uk/catalogues/istc.
• Gesamtkatalog der Wiegendrucke (GW), www.gesamtkatalogderwiegendrucke.de/GWEN.xhtml.

Other catalogues of hand-press-era books

• English Short Title Catalogue (ESTC), estc.bl.uk.
• Heritage of the Printed Book Database (HPB), www.cerl.org/web/en/resources/hpb/main.  Now freely available!
• Nineteenth Century Short Title Catalogue (NSTC), http://nstc.chadwyck.com.
• Universal Short Title Catalogue (USTC), www.ustc.ac.uk.

Digitized books

• Early English Books Online (EEBO, eebo.chadwyck.com.
• Eighteenth Century Collections Online (ECCO, http://gale.cengage.co.uk/product-highlights/history/eighteenth-century-collections-online.aspx.

Provenance

• Index Possessorum Incunabulorum (IPI), http://ipi.cerl.org.
• Material Evidence in Incunabula (MEI), www.cerl.org/web/en/resources/mei/main.
• Can You Help? www.cerl.org/web/en/resources/provenance/main.

Latin place name resources

• Orbis Latinus, www.columbia.edu/acis/ets/Graesse/contents.html.
• RBMS/ Bibliographic Standards Committee Latin Place Names File, http://net.lib.byu.edu/~catalog/people/rlm/latin/names.htm.