links Gerolf Steiner in the Berlin State Library catalog Notice of Gerolf Steiner's death 1908 births 2009 deaths 20th-century German zoologists Science teachers German centenarians German male writers Scientists from Strasbourg Heidelberg University alumni Technische Universität Darmstadt alumni Academic staff of the Karlsruhe Institute of Technology Academic staff of Heidelberg University Men centenarians 20th-century pseudonymous writers