As regards
Metcalf's
Coinage of the Crusades and the Latin East in the Ashmolean Museum, Oxford, only the second edition gets cited widely. It's twice the size of the first edition and the numbering of coins is different. It's a source of some frustration using the earlier edition.
I just updated the
Numiswiki entry to show the earlier edition (there are two entries, actually, one with "Crusades" and one with "
Crusaders").
Royal Numismatic Society, Special Publication no. 28. Second, revised edition (
London, 1995). 578 pages, 48 plates,
maps.
Royal Numismatic Society, Special Publication No. 15. (
London, 1983. First Edition). 248 pages, 36 plates.