Quarry Products Association - www.qpa.org

Mining and Quarrying Section of the NetRegs guidelines -
www.environment-agency.gov.uk

QMJ Publishsing Limited - www.qmj.co.uk

The Natural Stone Show 2006 - www.stoneshow.co.uk

Hillhead 2005 - www.hillhead.com

The Institute of Quarrying - www.quarrying.org

Health & Safety Executive - www.hse.gov.uk

The Institute of Asphalt Technology - www.instofasphalt.org