Metal Speciation in the Environment )J.A.C. Broekaert, Hans Harthus, Hans-Ulrich Giersch, Ditmar Schneider, Norbert Vogelsang · First published 2011Open the Tome
Elektrotechnik für FachschulenHans-Ulrich Giersch, Hans Harthus, Norbert Vogelsang · First published 1998Open the Tome
Elektro-Fachrechnen 1Klaus Großmann, Hans Harthus, Hans-Ulrich Giersch, Ditmar Schneider · First published 1989Open the Tome
