AccessPA POWER library
Search the resources available from your state library. From the above link, select "Power library", then your county and finally  your local library (you will need your public library card barcode number).

Project Gutenberg
Digitally republished full-text books. Includes English-language literature, reference resources, and historical documents in plain ASCII format.

Electronic text center
The Electronic text center from the University of Virginia contains fiction, non-fiction, poetry, letters, etc. from 1500 to the present.