B-Commercial use allowed - Free to use, Website - oceanofpdf.com
Jeanson-Nathaniel-Replacing_Darwin_-_The-NEW-Origin-of-Species-oceanofpdf.pdf
B-Commercial use allowed - Free to use, Website - www.brethrenarchive.org/
Anderson-Sir-Robert-A-Doubters-Doubts-about-Science-and-Religion-Or-In-Defence_-a-Plea-for-the-Faith-www.brethrenarchive.org_.pdf
B-Commercial use allowed - Free to use, Website - Archive.org
Grant-George-The-Life-of-Sir-Isaac-Newton.pdf
B-Commercial use allowed - Free to use
Newton-Isaac-Newtons-Principia-_-the-mathematical-principles-of-natural-philosophy-UCLA.pdf archive.org – UCLA library