"1. Books enlarged by post-publication insertion of matter illustrative of text e.g. portraits, maps, letters. The matter may involve mounting the original pages on larger sheets and rebinding into several volumes. Often called 'Grangerized' after the 'Biographical History of England,' published by Granger in 1769 with blank leaves for this purpose. A favourite subject is Clarendon's 'History of the Great Rebellion,' of which a copy in the Bodelian Library is a particularly celebrated example. 2. In a less objectionable meaning, the practice of issuing a parallel edition of a work with many more illustrations than are printed in the cheaper editions.
"The catalogue entry for an extra-illustrated book will mention this fact as a note, since the presence of the additional illustrations renders the copy unique, possibly increases its value and cannot properly be included in collation."
- "Encyclopedia of Librarianship" by Thomas Landau