Some major Digital Library centers and research programs, separately described:
ACM DL : Tap into the ACM Digital Library, a vast resource of bibliographic information, citations, and full-text articles.
IEEE-CS Digital Library
IBM
National Library of Medicine
Digital
Library Research Program at
Lister Hill
National Center for Biomedical Communications,
National Institutes of Health
OCLC (OCLC is a nonprofit,
membership, library computer service and research organization
dedicated to the public purposes of furthering access to the world’s
information and reducing information costs).
Xerox