12490.git, branch main Scientific American Supplement, No. 492, June 6, 1885 initial commit of ebook 12490 2025-10-15T11:40:06+00:00 Roger Frank rfrank@pglaf.org 2025-10-15T11:40:06+00:00 32fb833f7e2c054a9cb955e18eaefacaa009bb85