Air Conditioning Contractors of America (ACCA)
Provides service and information via manuals, software and government relations
http://www.acca.org/
 
American Academy of Environmental Engineers
Contains catalogues, directories and articles on environmental issues
http://www.aaee.net/
 
American Consulting Engineers Council (ACEC)
Publications, seminars and business resources for engineers
http://www.acec.org/
 
American Institute of Architects (AIA)
Offers educational opportunities, publications, meetings and government relations
http://www.aia.org/

American Institute of Certified Public Accountants
http://www.aicpa.com/

American Road and Transportation Contractors Association
http://www.artba.org/

American Society of Civil Engineers (ASCE)
http://www.asce.org/

American Society of Professional Estimators
Provides education, seminars, fellowships and certification
http://www.aspenational.com/
 
American Subcontractors Association (ASA)
Represents subcontractors and specialty trade contractors
http://www.asaonline.com/
 
Architecture Engineering Construction Information
Provides information on building products, software/hardware and government regulations
http://www.aecinfo.com/

Associated Builders and Contractors (ABC)
Building technology, labor issues, education, structural design and regulatory affairs
http://www.abc.org/
  
Associated General Contractors of America (AGC)
Information on proposed legislation, regulations and industry trends
http://www.agc.org/
 
Associated General Contractors of America - California
http://www.agc-ca.org/

Associated General Contractors of America - Washington
http://www.agcwa.com/

Associated General Contractors of America - Oregon
http://www.agc-oregon.org/

Associated General Contractors of America - Nevada
http://www.nevadaagc.org/

Associated General Contractors of America - San Diego
http://www.agcsd.org/

Building Owners & Manufacturers Association (BOMA)
Monitors and lobbies pertinent legislation, regulatory codes and standards and provides continuing education programs
http://www.boma.org/

Bigcharts - Publicly Traded Companies - Breakdown by Industry
http://www.bigcharts.com/

Bricsnet
Architectural and engineering information
http://www.bricsnet.com/

CA Franchise Tax Board
http://www.ftb.ca.gov/

California Society of Certified Public Accountants
Organization supporting Certified Public Accountants in the state of California
http://www.calcpa.org/

CalTrans: Department of Transportation
http://www.dot.ca.gov/

Construction Financial Management Association (CFMA)
Unites and provides information and educational programs to those who have financial responsibilities in the construction industry
http://www.cfma.org/
 
Construction Industry Institute
Research consortium to advance the capital projects industry
http://www.construction-institute.org/
 
Construction Statistics
http://www.census.gov/const/www

Department of the Treasury
http://www.ustreas.gov/

Engineering & Utility Contractors Association (EUCA)
http://www.euca.com/

FedWorld Information Network
http://www.fedworld.gov/

Federal Consumer Information Center
http://www.pueblo.gsa.gov/

F.W. Dodge
Provides project information used by construction industry
http://www.fwdodge.com/

Hard Hat Construction Group
http://www.hardhatconstructiongroup.com/

Institute of Management and Administration (IOMA)
Electronic newsletter covering most industry sectors
http://www.ioma.com/

Internal Revenue Service
http://www.irs.gov/

Mechanical Contractors Association of America (MCAA)
Represents companies engaged in the installation of heating, ventilation, air conditioning and process piping systems
http://www.mcaa.org/
 
National Association of Home Builders
http://www.nahb.com/

National Association of Surety Bond Producers (NASBP)
Offer seminars, schools, videos and publications
http://www.nasbp.org/
 
National Association of Women in Construction
http://www.nawic.org/

National Electrical Contractors Association (NECA)
Represents owners, managers and employees of electrical contracting companies
http://www.necanet.org/ 

National Paint & Coatings Association (NPCA)
Represents the paint and paint coatings industry before federal, state and local governments - air quality legislation
http://www.paint.org/
 
National Roofing Contractors Association
Preserve and promote the art of roofing application
http://www.roofonline.org/

National Utility Contractors Association (NUCA)
NUCA unties the underground utility construction industry under its leadership and speaks with one clear, autoritative voice to promote and defend the interest of its members.
http://www.nuca.com/
 
R.S. Means
Resource for cost estimating and management issues
http://www.rsmeans.com/
 
Secretary of the State of California
http://www.ss.ca.gov/

Surety Information Office (SIO)
Information source for surety bond industry news and trends
http://www.sio.org/
 
Thomas Register of American Manufacturers
Largest industrial buying and specifying guide on the internet
http://www.thomasregister.com/

Western Electrical Contractors Association
WECA-IEC offers federal and state approved commercial, residential, and voice-data-video apprenticeship programs.
http://www.weca-iec.org