numismatic literature
auction catalogs
Wruck Waldemar, Universalsammlung insbesondere Goldmünzen und Taler aus norddeutschem Besitz, 30.09.1940, Berlin
38 pages + 12 plates, 1,238 items, original cover, folds and fractures of cover, some plates without dividers, inside among others a three-ducat Wroclaw 1612, a two-ducat Wroclaw 1617 or a two-ducat Danzig 1658