Cambridge Core
A multidisciplinary database for the academic researchers provided by Cambridge University Press.  Cambrige Core has over 1 million journal articles and 30,000 ebooks.  
CGP (Catalog of U.S. Government Publications)
Indexes print and electronic publications of the U.S. government, the world's largest publisher. 1976 - present.
Chronicle of Higher Education

CQ Researcher Online
CQ Researcher contains in-depth, non-biased coverage of political and social issues, with regular reports on topics in health, international affairs, education, the environment, technology, and the U.S. economy.  1991 - present.. 
Credo Reference
Digital library of over 700 cross-searchable reference books in a wide variety of disciplines. A great starting point for your research that also leads you right to the library catalog and other databases.