The Internet Archive, a 501(c)(3) non-profit, is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, they provide free access to researchers, historians, scholars, and the general public.
This free site allows you to search and view newspaper pages from 1880-1922 fand find information about American newspapers published between 1690-present. Chronicling America is sponsored jointly by the National Endowment for the Humanities and the Library of Congress as part of the National Digital Newspaper Program (NDNP). Historical newspapers full text.
More than 4,000 National Academies Press (National Academy of Sciences, National Academy of Engineering, Institute of Medicine, and National Research Council) PDFs now available for free. This includes some of the popular Nutrient Requirements series.