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Simply Explained. New York: Dover Publications, Inc. pp. 13–14. ISBN 978-0-486-21071-1. Mokyr, Joel (1990). The Lever of Riches: Technological Creativity...241 KB (29,158 words) - 06:28, 27 April 2024
 | Simply Explained. New York: Dover Publications, Inc. pp. 13–14. ISBN 978-0-486-21071-1. Mokyr, Joel (1990). The Lever of Riches: Technological Creativity... 241 KB (29,158 words) - 06:28, 27 April 2024 |