This small collection includes photos taken by the German invading forces in September 1939 as well as photos related to Drzewieniecki’s participation in this military campaign. The “WWII Documents” section of the Drzewieniecki collection includes the notebook he kept during these battles and his experiences in this period are described in: Wrześniowe wspomnienia podporucznika. Warszawa: Wydawnictwo Ministerstwa Obrony Narodowej/Program in East European and Slavic Studies, State University College at Buffalo, Buffalo, N.Y., Publication No. 10, 1978, and are referred to in a number of other publications.