Poznań - Adam Mickiewicz University, 1968.
Ph.D. commencement ceremony of Lech Krzyżaniak.
From the left: Parents - (1) Leon and (2) Jadwiga Krzyżaniak; (3) Lech Krzyżaniak, Ph.D.;
(4) Prof. Jan Żak (supervisor; Institute of Prehistory, Adam Mickiewicz University).