Leonardo da Vinci links
National Museum of Science and Technology, Milan, Italy.
In English, a comprehensive illustrated list of Leonardo's inventions.
School of Mathematics and Statistics, University of St. Andrews, Scotland
American Museum of Natural History, New YorkCity
Museum, Paris - timeline
Art, Inventions, & Drawings of Leonardo
Highlands Ranch, Colorado, USA
A year by year chronology of the life of Leonardo; also, his study of