All of these books are made available free of charge in the public domain. They have been released under the GNU Free Documentation License, the terms of which are available here:
GNU Free Documentation Licence.
Please note that these titles are available copyright free in the USA, other countries laws may vary and you should find out before downloading. Most of these books are either the open source "epub" versions that can be read in most ebook readers or the Kindle "mobi" version.
At present I have very little time to read, review or add new titles. If you can't find what you want here, I recommend either Project Gutenberg, Feedbooks or Manybooks, each of which have a vast amount of books available in the public domain.
A long time ago a bunch of people reached a general consensus as to what’s real and what’s not and most of us have been going along with it ever since