A simplified presentation of Einstein's unified field equations, by 78343 Tullio Levi-Civita [Author: Tullio Levi-Civita] [Translator: John Dougall] [Link: https://www.gutenberg.org/ebooks/78343] note: link will be active within two hours of posting. Thanks to Produced by Laura Natal (Images generously made available by Hathi Trust.) Regards, Robert ~ Robert