The foundations of Einstein's theory of gravitation, by Erwin Freundli 70793 [Full title: The foundations of Einstein's theory of gravitation] [Full author's name: Erwin Freundlich] [Author: Erwin Freundlich] [Contributor: Albert Einstein] [Translator: Henry Leopold Brose] [Contributor: Herbert Hall Turner] [Link: https://www.gutenberg.org/7/0/7/9/70793] [Files: 70793-h.htm] Thanks to Laura Natal Rodrigues (Images generously made available by Hathi Trust Digital Library.) Regards, Al