For more information on the precast process and industry, visit these sites... www.archprecast.org - The Architectural Precast Association is a not-for-profit trade association organized to serve the informational, technical and business needs of Architectural Precast Concrete manufacturers and their suppliers and to promote high standards of workmanship throughout the industry. www.abcnhvt.com - The New Hampshire and Vermont chapter of Associated Builders and Contractors.