The Internet
Classics Archive (Searchable Database of 441 Classics, Including Greco-Roman
and Persian, and translated into English) http://classics.mit.edu/
Library
of Congress (a vast array of historical material is now online; including
some audiovisual material) http://www.loc.gov
Links
to plethora of news and reference resources in many areas www.refdesk.com
Rare book,
manuscript, and Special Collections library at Duke University (great
history of advertising material) http://scriptorium.lib.duke.edu/