The following comprise some of our favorite sites and databases through which you may locate collections and repositories around the world.

ArchiveGrid,
for historical documents and personal papers in museums and archives
ArchivesUSA® database, Williams College only
NARA,
the National Archives and Records Administration page
National Union Catalog of Manuscript Collections,
a searchable database operated by the Library of Congress
Massachusetts Special Collections Directory,
a database of primary sources in Massachusetts developed by the Massachusetts Library and Information Network
Primary Sources on the Web,
maintained at UC Berkeley
Repositories of Primary Sources,
maintained at the University of Idaho
RootsWeb,
for genealogy research
Scipio,
database of auction catalogs with art work provenance and sale information
Special Collections on the Web,
maintained by the Rare Books and Manuscripts Section of the Association of College and Research Libraries
UNESCO Archives Portal,
an international gateway for archivists and archive users