Formation for Citizenship in Catholic SchoolsBernadette O'Keeffe, Richard Zipfel, Larry McHugh, Kevin Quigley, Von Hugel Institute Staff · First published 2007Open the Tome
Community DevelopmentLucy Gaster, Tricia Zipfel, Richard Crossley · First published 2000Open the Tome
Die preussischen staatl. Elektrizitätswerke im Weser-MaingebietRichard Zipfel · First published 1930 · Latest edition 1933Open the Tome
