Vaulted Treasures: Historical Medical Books at the Claude Moore Health Sciences Library at the University of Virginia. Digitized editions are available here and through the Hathi Trust.
E-text of books, many are full-text with no restrictions. Excellent source for books published after conflicts prior to 1950. Largest collection is pre-1923. Search by topic or keyword to locate books. Also includes government reports.
"The MHL’s growing collection of digitized medical rare books, pamphlets, journals, and films number in the tens of thousands, with representative works from each of the past six centuries, all of which are available here through the Internet Archive."
e-text available through Harvard University Library. Separate pages for Cholera, Smallpox, Syphilis, Yellow Fever, Great Plague, Spanish Flu, Tuberculosis, and Tropical Fevers.
Databases for Research on Medieval and Renaissance Medicine
Provides full-text and images of over 1000 scholarly, peer-reviewed journals in a variety of disciplines. Has best coverage in older volumes of journals.