Polish publications
Iger Tadeusz - Katalog Trojaków Polskich, Warsaw 2008, ISBN 9788392333241
330 pages in B5 format, hardcover, the first item cataloguing all Polish tri-penny coins, covering issues from the time of Sigismund I the Old to the 19th century, along with fief issues and Silesian Duchies, the work catalogs 740 basic types of coins, and counting with varieties includes more than 2,000 of them, each type is presented on the photo, often in several varieties
