TY  - BOOK
AU  - Clark,Kenneth
TI  - Leonardo da Vinci,: an account of his development as an artist
T2  - A Pelican book
AV  - ND623.C593.L466 1959 
PY  - 1959///
CY  - Baltimore
PB  - Penguin Books
N1  - Bibliography: pages 165-168; 2
ER  -