Wren, C. R. The Voided Long-Cross Coinage 1247-1279. Henry III & Edward I. An illustrated Guide to Identification. London, 1993. Second revised edition, 2006. 84 pages, line drawings throughout. Card covers. The 2006 reprint of this popular and useful book, intended not as a scholarly work, but instead as an introduction to the voided long cross coinage for new collectors and beginners, and also as an aid in classifying these coins. Now revised, little of the original text has been changed, although there is included an interesting new discovery of a previously unknown moneyer, as well as an extended bibliography.