www.assomarmi.it
Italian Marble
Association
www.assofom.it
italian marble forniture
association
www.assomarmistilombardia.it
Lombardy Stone
Association
www.asmave.it
Verona stone
association
www.cosmave.it
Versilia Stone Consortium
www.centrotravertinoromano.it
Institute for the Travertino of Rome
www.consorziomarmistichiampo.it
Chiampo Valley Stone Association
www.porfido.it
E.S.P.O.
Institute for the development of Porfido
www.cet.bz
C.E.T.
Trento Quarrying consortium
www.videomarmoteca.it
Research Lab on stone materials of
Volargne VR
www.pietranaturale.it
The Italian mark protecting the real natural stone products
www.bstone.it
Italian on line stone magazine

www.fepa-abrasives.com
Fepa norms
www.astm.org
American Society for Testing and Materials, normative tecniche ASTM
www.iso.ch
International Standard Organisation
Normative ISO
www.uni.com
Italian normative institute