American Concrete Institute - www.aci-int.org
The American Institute of Architects - www.aiaonline.com
American Society of Landscape Architects - www.asla.org/asla
American Society of Testing & Materials - www.astm.org
Architectural Precast Association - www.archprecast.org
Brick Institute of America - www.bia.org
Canadian Portland Cement Association - e-mail: headquarters@cpca.ca   www.cpca.ca
Cast Stone Institute - www.caststone.org
Concrete Homes - www.concretehomes.com
Construction Industry Manufacturers Association - www.cimanet.com
Construction Specifications Institute - www.csinet.org
The Construction SuperNetwork (Aberdeen Group) - www.supernetwork.net
Council for Masonry Research - www.masonryresearch.org
Expanded Clay and Slate Institute - www.concreteworld.com/escsi
Insulating Concrete Form Association - www.forms.org
Interlocking Concrete Pavement Institute -www.icpi.org/icpi
The Masonry Society - www.masonrysociety.org
National Association of Home Builders - www.nahb.com
National Concrete Masonry Association - www.ncma.org
National Precast Concrete Association - www.precast.org
National Ready Mixed Concrete Association - www.nrmca.org
National Terrazzo and Mosaic Association - www.ntma.com
National Tile Roof Manufacturers Association - www.ntrma.com
Portland Cement Association - www.portcement.org
Precast/Prestressed Concrete Institute - www.pci.org
Stucco Manufacturers Association - www.stuccomfgassoc.com
Tilt-Up Concrete Association - www.tilt-up.org