• Energy Star - http://www.energystar.gov/
• EPSMA - http://www.epsmolders.org/
• ELK Building Products - http://www.elkcorp.com/
• Federal Highway Administration Information on EPS Geofoam - http://www.fhwa.dot.gov/resourcecenter/teams/geotech/geo_4eps.cfm
• Oak Ridge National Laboratory - http://www.ornl.gov/sci/btc/
• Radco, Inc. National Testing Laboratory - http://www.radcoinc.com
• Structural Insulated Panel Association - http://www.sips.org/
• Trufast, LLC - http://www.trufast.com/
• Tri-State Laminates, Inc. - http://tri-statelaminates.com
• Underwriters Laboratory - http://www.ul.com

NRDC (Natural Resources Defense Council) - http://www.nrdc.org 
NRDC is the nation's most effective environmental action organization. NRDC uses law, science, and the support of more than 1 million members and online activists to protect the planet's wildlife and wild places and to ensure a safe and healthy environment for all living things. NRDC's website provides a wealth of environmental information as well as state-of-the-art online activism tools.