Wolters was a regular contributor to the german publication
’Goldschmiede Zeitung’ which is published by the Ruhle-Diebner Verlag.
They have a web site, which shouldn’t be dificult to locate.
here it is (english version):
http://www.gz-journal.de/info/englisch/ausgabe_e.cfm
oakland, california
http://www.sirius.com/~ema