Wolfgang Helbing

title		ISBN-13 (ISBN-10)	year of publica- tion	other author(s)
Chemical tables for laboratory and industry: Matter, number, process		978-0-470-26910-7 (0-470-26910-3)	1979
Kleines Lehrbuch Chemie		978-3-427-56450-8 (3-427-56450-9)	1982	Günther Heimann