Finding Public Domain Material

 There are a number of terrific resources out there that provide public-domain content. Consider the following:

• Project Gutenberg: This site has over 60,000 public domain ebooks. And it is by far the best resource on this list. If you can't find the public domain title here, there is a much lesser chance of finding it elsewhere, with a few exceptions. It's also where I get most of my public-domain books.
• Archive.org: Another great resource with tens of thousands of public domain books, as well as a lot of other material, including magazine scans, films, audio, and more. This is where I have gotten a lot of things like original scans of a book or magazine.
• Sacred Texts: This is a site that specializes in religious works of a wide variety of religions. It's one of the best resources for public domain works that are religiously based.
• LibriVox: This isn't for ebooks or print, but does contain audiobooks of a lot of classic public domain books. While you can't go and upload these to ACX, you can include them as bonus material on your website, or in other creative ways.
• Authorama: Authorama is a site that focuses on the greatest authors throughout history. It's a good place to get the classics.
• Classic Literature Library: This site partners with Project Gutenberg but is notable for having great collections of public domain works, particularly by the more popular authors.
• Google Search: You’re likely to find what you’re looking for with the above resources, but if not, there are many other, sometimes genre specific, resources that are a Google search away. To do this well, I recommend searching for the work you're looking for, then adding something like “full text” or “PDF” to the end of your search. If you don't see it come up anywhere, then it likely doesn't exist in a digitized form. But don't necessarily let that stop you. If there's demand for the work, you could have it transcribed and make it available yourself!