Ertl, Theo2007-01-032022-02-092007-01-032022-02-09https://hdl.handle.net/11124/70845Biography written by the Ertl family, including Theo, wife of Tell Ertl.reportsengIn Copyright (http://rightsstatements.org/vocab/InC/1.0/).Oil-shale industryShale oilsText