On the initiative of the IPN Poznań Office, Wielkopolska Printing & Publishing issued a four-volume book ”The Polish Underground State in Wielkopolska 1939–1945.” Head of the IPN Poznań Office, Ireneusz Adamski, defines the book as ”one of the special cornerstones” laid for the construction of the Polish Underground State monument in Poznań.
Volume I ”Ausrotten – Exterminate. The German Occupation of Wielkopolska 1939–1945”
Volume II ”Like a Phoenix from the Ashes. The Structures of the Polish Underground State in Wielkopolska 1939–1945”
Volume III ”We shall defend every threshold… Social resistance and conspiracy in Wielkopolska 1939–1945”
Volume IV ”Till the last drop of blood… Forms of Struggle and Resistance in Wielkopolska 1939–1945”