EbscoHost is a hosting site for multiple databases that include periodicals, eBooks, academic journals, images, etc. Once you click on the link, select the database you want to use.
The Gale Virtual Reference Library offers access to numerous eBooks for various subjects, ranging from medicine to history and science. This is a great place to locate reference materials on a topic.
Great resource for primary source documents by various individuals in different periods of history. This link focuses on Imperialism, but in the menu on the left you can select other periods in history.
