In 1965 two previously lost notebooks were discovered in the National Library of Spain, Madrid. The first is a vast work concerning technological principles; the second is an intellectual diary spanning 14 years. The lost notebooks were published as The Madrid Codices (1974).
See also L. Goldschneider, ed., Leonardo da Vinci: Life and Work, Paintings and Drawings (8th ed. 1967), P. C. Marani, Leonardo da Vinci: The Complete Paintings (2001), C. C. Bambach, Leonardo da Vinci: Master Draftsman (2003), F. Zöllner, Leonardo da Vinci: 1452–1519, The Complete Paintings and Drawings (2003), and M. Clayton and R. Philo, Leonardo da Vinci: Anatomist (2012); The Notebooks of Leonardo da Vinci, ed. by J. P. Richter (2 vol., 1970), The Literary Works of Leonardo da Vinci, ed. by J. P. Richter (3d ed. 1970), and M. Kemp, ed., Leonardo on Painting: Anthology of Writings by Leonardo da Vinci (1989); biographies by K. Clarke (rev. by M. Kemp, 1989), C. Nicholl (2004), and M. Kemp (rev. ed. 2011); I. B. Hart, The World of Leonardo da Vinci (1962, repr. 1977), P. R. Ritchie-Calder, Leonardo and the Age of the Eye (1970), C. Pedretti, Leonardo: A Study in Chronology and Style (1973), L. Reti, ed., The Unknown Leonardo (1974), A. R. Turner, Inventing Leonardo (1993), and R. King, Leonardo and the Last Supper (2012).
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