Natural Stone Institute Various Recommendations
Various recommend links
Dr.-Ing. Singewald
http://www.singewald.de
Naturstein-Institut
http://www.naturstein-institut.de
IHK Gera
http://www.ihk.de/gera
IHK Berlin
http://www.ihk-berlin.de
Bundesanstalt für Geowissenschaften
http://www.bgr.de
Further pages...
DIN
http://www.din.de
Responsible for the contents, but not for the contents of links, Dr.-Ing. Ch. Singewald. Copyright 2006 by Dr.-Ing. Ch. Singewald. All Rights Reserved.
Various
recommend links