Grolier Reference Online 
Includes American Language Dictionary of the English Language, 4th ed., American Heritage Spanish to English Dictionary, American Heritage English to Spanish Dictionary, Roget's II: The New Thesaurus, 3rd ed., and Encyclopedia Americana.
Note: encyclopedias, dictionaries, atlases
Oxford English Dictionary
The complete contents of the second edition of The Oxford English Dictionary. Tutorial. Database Guide (PDF)
Oxford Language Dictionaries Online
Translations of thousands of Chinese, French, German, Italian, Russian, and Spanish words and phrases.
Note: six languages
Digital Dissertations/Abstracts and Full Text
Indexes two-million dissertations from over one-thousand institutions, with citations from 1861-1980 and abstracts from 1980+. Includes the full text of most CUNY dissertations and post-1997 dissertations from other institutions. Database Guide (PDF)
Note: citations, abstracts, recent text
Gale Virtual Reference Library
Full text of 275 reference books published by Gale, Brill Academic, Cambridge University Press, Elsevier, Greenwood, Sage, Salem Press, Wiley, and others. Titles include American Civil War Reference Library, Ancient Europe, 8000 BC to AD 1000, Encyclopedia of Aging, Encyclopedia of American Religions, Encyclopedia of Case Study Research, Encyclopedia of Gender and Society, Encyclopedia of Urban Studies, Encyclopedia of World Biography, Gale Encyclopedia of Multicultural America, Gale Encyclopedia of U.S. Economic History, Magill's Survey of World Literature, Vietnam War Reference Library; World Education Encyclopedia.
Note: 275 reference books
Oxford Reference Online
Text of more than 100 Oxford University Press reference works, including Oxford Companions to American Literature, American Theatre, the Bible, British History, Classical Civilization, History of Modern Science, Music, Philosophy, Politics of the World, Shakespeare, United States History, and Western Art.
Note: over 100 reference works
Handbooks in Economics Series
Text of 31 Elsevier titles.
Note: 31 titles
PEP: Psychoanalytic Electronic Publishing
Psychoanalytic Electronic Publishing provides the full text of 26 psychoanalysis journals from 1871 through 2006, 56 classic psychoanalytic books, and all 24 volumes of The Standard Edition of the Complete Psychological Works of Sigmund Freud.
Note: psychoanalytic journals and texts
PsycBooks
This American Psychological Association (APA) database provides the full text of more than 2,000 APA books published since 1950, including over 100 out-of-print titles. Also included are 1,500 archival resources from other publishers dating back to the 1660s and more than 1,500 entries from Encyclopedia of Psychology, published in 2000 by APA and Oxford University Press.
Note: 2,000 APA books
AMS: Online Books 
Growing database of research-level mathematics and math-related books. Content may be downloaded free at the article level.
ARTFL Project
Over 2,600 French literary texts from the University of Chicago. The New York Public Library offers a more complete version of ARTFL texts online.
Note: French literary texts
Cambridge Histories Online
Full text of 250 Cambridge University Press reference works published since 1960. In addition to history, these titles cover economics, the history of science, the history of the book, language and linguistics, literature, music, philosophy, political and social theory, religion, theatre and performing arts, and warfare.
Note: 250 reference works
ebrary
Approximately 68,000 electronic books in all disciplines from such publishers as BIOS Scientific Publishers, Brill Academic Publishers, Brookings Institution,Cambridge University Press, Columbia University Press, Cornell University Press,Greenwood Press, Harvard University Press, John Wiley, Johns Hopkins University Press, Kluwer Academic Publishers, Manchester University Press, MIT Press, Oxford University Press, Palgrave-Macmillan, Princeton University Press, Random House, Springer, Stanford University Press, University of California Press, University of Chicago Press, World Bank, and Yale University Press. Guide
You can also search the catalog to see if a title is available with ebrary.
Note: 68,000 scholarly books
EBSCO eBook Collection
Formerly known as NetLibrary the EBSCO eBook Collection hosts a collection of more than 2,800 recent scholarly titles as electronic books. These titles represent all disciplines and are aimed at both undergraduate and graduate research needs. While all of CUNY shares a core of titles, several campuses, including the Graduate Center, have purchased additional titles. To use the database from home, you must first connect to the site on any CUNY campus and click on Create a free account. Accounts can also be created by connecting to to the database remotely. Titles may be checked out for only twenty-four hours. All available titles also appear in the CUNY Catalog.
Note: more than 2,800 electronic books
Eighteenth Century Collection Online (ECCO)
ECCO offers every page of 150,000 books published during the eighteenth century in English, Dutch, French, German, Italian, Latin, Spanish, and Welsh. In addition to searches by author, title, and publisher, these books may be searched by individual categories such as fine arts, history and geography, law, literature and language, medicine, science, and technology, religion and philosophy, social sciences, general reference, or a combination of two or more subjects. Illustrated works may be searched by cartoon, map, music, portrait, etc. ECCO may also be browsed by author and title.
Note: over 150,000 books
National Academies Press
Note: more than 4,000 free books
NetLibrary
NetLibrary hosts a collection of 2,594 recent scholarly titles as electronic books. These titles represent all disciplines and are aimed at both undergraduate and graduate research needs. While all of CUNY shares a core of NetLibrary titles, several campuses, including the Graduate Center, have purchased additional titles. NetLibrary also provides access to over 3,400 public-domain titles. While no title list is provided within NetLibrary, one can be created by going to CUNY+, limiting the search to the Graduate Center, and performing the keyword search netlibrary. To use NetLibrary from home, you must first connect to the site on any CUNY campus and click on Create a free account. Accounts can also be created by connecting to NetLibrary remotely. Titles may be checked out for only twenty-four hours. Student accounts are purged at the end of each spring semester, necessitating creating new accounts. This brief guide may also be helpful. Several CUNY campuses own NetLibrary titles not available to Graduate Center affiliates. Mac users must download a free PDF browser plug-in for off-campus use. New York Public Library Electronic books are also available from New York Public Library. Links to numerous sources of public-domain books can be found at The Online Books Page. Database Guide (PDF)
Note: 2,800+ scholarly books
The Online Books Page
Directory of over 30,000 books free online, by UPenn.
Oxford Scholarship Online
Full text of 3,772 scholarly books published by Oxford University Press. While the Graduate Center subscription allows access to abstracts of books in other disciplines, text is available for titles only in economics and finance, history, linguistics, literature, mathematics, music, philosophy, political science, and psychology. Guide
Note: text of scholarly books
Project Gutenberg
Over 30,000 books digitized by volunteers available free in the USA under expired copyright.
Springer eBook Collection
Text of 19,000 Springer books published from 2005 to the present as well as book series dating back to 1997. The titles cover biomedical and life sciences, computer science, medicine, physics, and related fields. Guide
Note: 19,000 books
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Mina Rees Library