http://www.gutenberg.org/ebooks/subject/809.opds 2024-11-08T15:06:29Z Books about Calculators (sorted by popularity) Free eBooks since 1971. Project Gutenberg https://www.gutenberg.org webmaster@gutenberg.org https://www.gutenberg.org/gutenberg/favicon.ico 25 1 2024-11-08T15:06:29Z https://sendtokindle.compellingsciencefiction.com/ebooks/subject/809.opds?sort_order=title Sort Alphabetically by Title 2024-11-08T15:06:29Z https://sendtokindle.compellingsciencefiction.com/ebooks/subject/809.opds?sort_order=release_date Sort by Release Date 2024-11-08T15:06:29Z https://sendtokindle.compellingsciencefiction.com/ebooks/71292.opds The calculating engine Charles Babbage 2024-11-08T15:06:29Z https://sendtokindle.compellingsciencefiction.com/ebooks/69386.opds Origin of modern calculating machines J. A. V. Turck 2024-11-08T15:06:29Z https://sendtokindle.compellingsciencefiction.com/ebooks/27936.opds Histoire des nombres et de la numération mécanique (French) Jacomy-Régnier