1. Verner , Coolie . Copperplate printing. Edited by:
Woodward . 51–75. op. cit.
2. Painter , G. D. 1976. William Caxton: a quincentenary biography 215London Naturally, art historians and incunabulists have been well aware of these problems. A recent study used six stages of damage to William Caxton's woodcut publisher's device as a way of ascribing his undated works to their correct period. See
3. Rüst's and Sporer's world maps