Concordance
Concordance. A chart identifying the same item by the catalog numbers in two or more numismatic catalogs, check lists or other publications. Thus the reader may quickly learn the equivalent number of a specific variety in two or more published listings or catalogs. A cross index means the same. See numbering systems.
excerpted with permission from
An Encyclopedia of Coin and Medal Technology
For Artists, Makers, Collectors and Curators
COMPILED AND WRITTEN BY D. WAYNE JOHNSON
Roger W. Burdette, Editor