There has been data ("Dynastia Piastow Mazowieckich: Studia Nad Dziejami Politycznymi Mazowsza, Intytulacja I Genealogia Ksiazat - ISBN-13 978-83-935137-8-9") available for this ISBN from the data sources that books-by-isbn.com uses, but not on the latest request on Thu Sep 5 14:51:51 2019, so the data displayed here has been removed .