Yes! Public domain means that the copyright or trademark has expired and the work is free to the public for viewing and use. A lot of books can be found online in any E-reader format, with many being available from The Gutenberg Project and the Library of Congress. Also, get a library card! Your local library likely has a lot of these available, and if not, speak to the librarian and they may be able to order it for you. It’s always great to support local libraries and bookstores.