| nahbrc.org | National Association of Home Builders |
| nahb.org | National Association of Home Builders (NAHB) |
| mcaa.org | The Mechanical Contractors Association Of America! |
| imiweb.org | Imi Splash Page |
| csinet.org | The Construction Specifications Institute |
| carpenters.org | United Brotherhood of Carpenters and Joiners of America |
| builderonline.com | Builder Magazine: Home Building News, Home Planners, Home Design Ideas and Build |
| agc.org | The Associated General Contractors (agc) Of America |
| acca.org | Air Conditioning Contractors of America |
| abc.org | Associated Builders and Contractors (ABC) |
| nahb.com | www.nahb.com/ |
United States , District of Columbia , Washington