Leonardo da Vinci: Codice sul volo degli uccelli e varie altre materie. Pubblicato da Teodoro Sabachnikoff. Transcrizione e note di Giovanni Piumati; traduzione francese di Carlo Ravaisson-Mollien.

The scientific study of the mechanics of flight begins with Leonardo’s investigations on birds, undertaken during his attempts to build a flying machine. At the time of publication Sabachnikoff owned the manuscript. After publishing this facsimile he donated the original to Umberto I, who turned it over to the Royal Library of Torino. Digital facsimile from the Internet Archive at this link.