ASTM – www.astm.org/
APT
Association for Preservation Technology – www.apti.org/
CSI
Construction Specifications Institute – www.csinet.org/
CM
National Concrete Masonry Association – www.ncma.org/
SWA
Sealant Waterproofing & Restoration Institute – www.swrionline.org/
The Masonry Society – www.masonrysociety.org/