More and more books--both old and new--are available free to read on the internet. Some are in the public domain (i.e., no copyright restrictions) while others are open access (copyrighted, but allow you to read, and sometimes share and modify, files for free).
These can be a valuable supplement to books you get through the library.
They are ordered roughly by how many books they have available. Some books are available on more than one site.
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