-- many forgers' offices in the region of
Constance (Konstanz) [above all the monastery
of Saint Gall] (Topper, chapter 4: "A look
into the workshop", p.58)
-- forgers' monastery of Monte Cassino
(Topper, chapter 4: "A look into the
workshop", p.58)
-- forgers' monastery at Corbie in northern
France (Topper, chapter 6: "Fathers of
Historiography", p.132)