In addition to the eBooks they sell, Google has over a million free Google Play Books from the public domain. Choose from a diverse collection of public domain titles -- from well-known classics to obscure gems. Many are available to download in EPUB and/or PDF format.
You can get full text magazines from Google's archive, including titles like Life which are no longer published and Popular Science which have been around for over 100 years and continue to be published. Titles are limited.
Google has worked with newspapers to digitize materials via the News Archive Partner Program. The date to which these newspapers go back varies by newspaper, but many go back to the mid 19th century, and some even earlier. Titles are limited.