Early English Books Online - EEBO
Database of most imprints (books, pamphlets, and broadsides) published in English anywhere or published in any language in English-speaking countries, appearing from 1473 to 1700. One can search the full ASCII text of selected* documents and view both the text and the corresponding original page images.
Useful for research in all subject areas during the early modern period. Also helpful to study the history of books and printing.