2100 BC+ WorldCat connects you to the collections and services of more than 10,000 library worldwide.
This site allows users to directly search the collection of freely available academically-oriented digital resources.
A digital library of Internet sites and other cultural artifacts in digital form.
From one place, you can search across many disciplines and sources: peer-reviewed papers, theses, books, abstracts and articles, from academic publishers, professional societies, preprint repositories, universities and other scholarly organizations.
Single search interface to > 2,500 journals, books & reference works in life, physical, medical, technical and social sciences.
Darwin Online provides access to Darwin's complete publications, many handwritten manuscripts and private papers and the largest Darwin bibliography and manuscript catalogue ever published.
This site is the work of the Darwin Correspondence Project. It contains basic descriptions of more than 15,000 letters known to have been written by or to Charles Darwin, and the complete texts of around half of those.
Twelve major natural history libraries, botanical libraries & research institutes including the MBLWHOI Library have collaborated to digitize the published literature of biodiversity held in their respective collections. Over 12 million pages are searchable using the uBio species name-finding tool.