Nefryt

year of pub­li­ca­ti­onISBNauthor(s)title
1998978-83-87355-03-6Janusz Parchimowicz2012 Katalog Monet Polskich - 2012 Edition of Catalog of Polish Coins
  ''978-83-87355-07-4Frank BartelAuszeichnungen der Deutschen Demokratischen Republik 1949-1990
2012978-83-87355-68-5Janusz ParchimowiczKatalog Monet Polskich 2012 (Polish Coins Catalog)