More from this Author
Found 2 books by Walter Hack

Modern School Business Administration
by Walter Hack, James Guthrie, Christina Hart, John Ray, I. Candoli

N Nitrogen
by Peter Merlet (Editor-In-Chief, Editor), Carol Strametz, Dieter Koschel (Editor), Walter Hack, Reinhard Haubold, Claudia Heinrich-Sterzel, Ulrike Ohms-Bredemann (Editor), Joachim Wagner (Editor), Hannelore Keller-Rudek, Dag Schiöberg