Digital Book Index provides links to more than 165,000 full-text digital books from more than 1800commercial and non-commercial publishers, universities, and various private sites.
More than 140,000 of these books, texts, and documents are available free.
Reference Books: More than 2000 Dictionaries, Encyclopedias, Thesauri, Glossaries, Bibliographies, Chronologies, Timelines, Literary Histories, Biographies, Writing & Style Guides & Student Study aids.
Medicine & Health: An extensive collection of about 1500 medical & health books for both professionals & patients (Anatomy, Radiology, Infectious Diseases, Endocrinology, Hematology, Neuroscience, Surgery, Oncology, Virology, Dentistry, Public Health, etc. etc.), along with medical history.