Taken from the copyright page:
'Leonardo Da Vinci Was First Published by Cambridge University Press in 1939. A Revised Edition Was Published by Penguin Books in 1959 and Reprinted With Revisions in 1967. It Was Published With Further Revisions and an Introduction by Viking in 1988. The Text of This Edition Follows That of the 1988 Edition With Minor Emendations.'
Printed in Great Britain by Cambridge University Press
Bound by Them in Buckram With a Printed Front Board