WorldCat is the world's largest library catalog, helping you find library materials online.
Digital Public Library of America
Discover 44,369,376 images, texts, videos, and sounds from across the United States. The Digital Public Library of America amplifies the value of libraries and cultural organizations as Americans’ most trusted sources of shared knowledge. We do this by collaborating with partners to accelerate innovative tools and ideas that empower and equip libraries to make information more accessible.
Library of Congress Digital Collections
This Library of Congress project provides access to a large number of LoC collections, searchable and browsable by subject and title, including a large quantity of digitized primary source material.
MedlinePlus is an online health information resource for patients and their families and friends
A pioneer of open access publishing, BMC has an evolving portfolio of high quality peer-reviewed journals including broad interest titles such as BMC Biology and BMC Medicine.
Bartleby.com offers a wide range of classic full-text searchable reference works.