Dibdin, Thomas Frognall; Spencer, George John [Oth.]: Bibliotheca Spenceriana: or a descriptive catalogue of the books printed in the fifteenth century, and of many valuable first editions, in the library of George John Earl Spencer (Band 1) (London, 1814) [Cicognara, 4650-1]

Fac-simile of one of the Cuts in the Ars Memorabilis per Figuras: supposecl to have been

executecl between the years 1420 ancl 1430. [To face p. vi.