ADSC: The International Association of Foundation Drilling - www.adsc-iafd.com

ASCE - American Society of Civil Engineers - www.asce.org

DFI - Deep Foundations Institute - www.dfi.org

Foundation for Professional Practice - www.fppnet.org

Geo-Institute - www.geoinstitute.org

Geo Council - www.geocouncil.org

International Construction & Utility Equipment - www.icuee.org

Watson USA - www.watsonusa.com

Votec Hydraulic Service, Inc. - www.votechydraulicservice.com

www.wfjdrillingtools.com

www.apevibro.com

www.jandm-usa.com

www.sipdrill.it