Links you want, links you'll get:
The Internet Archive
"The Internet Archive is building a digital library of Internet sites
and other cultural artifacts in digital form. Like a paper library, we
provide free access to researchers, historians, scholars, and the
You'll note that the Archive offers materials in a variety of formats
-- texts, audio, video, etc. Their collection of thousands of online
public-domain texts is here:
Welcome to the Open-Access Text Archive.
This collection is free and open for everyone to use.
Have fun browsing.
Another large collection of public domain materials is here:
The Online Books Page
"...Listing over 25,000 free books on the Web"
and you can browse books by subject area, here:
Last on the list, but perhaps the deepest resource of all, is the
federal government. Just about everything they print is public domain
material. There isn't a centralized source of everything available --
they tend to post materials agency by agency -- but a pretty good set
of links and search tools is here:
Publications from the U.S. Government
There aren't many topics that Uncle Sam hasn't published some sort of
treatise on, and it's all there for the taking.
Enjoy yourself. Let me know if there's anything else I can do for you on this.
search strategy -- Used bookmarked links for public domain materials.