The list of memoirs and diary materials concerning prisoners of German camps and forced labourers in East Prussia, located in the library of the North Institute of W. Kętrzyński in Olsztyn was drawn up on the basis of the current library catalogue based on the study of Zbigniew Fras – Diary materials in the collection of the W. Kętrzyński Scientific Research Centre in Olsztyn. Which are an addition information collected mainly on special harvest located in library of North Institute after year 1985. The purpose of this thematic summary was primarily to collect and update the documentation to the current state of knowledge, to explain the differences between the study of Fras, the catalogue and the facts, and to correct the noted errors.