Alternative Energy.Org
http://www.altenergy.org/transition/transition.html
Natural Gas.org
http://naturalgas.org/overview/uses/
Procon.org
http://alternativeenergy.procon.org/view.resource.php?resourceID=001797
Center for Climate and Energy Changes
http://www.c2es.org/technology/factsheet/ResidentialBuildingEnd-Use
Water Proof Magazine
http://www.waterproofmag.com/back_issues/201204/Sealed_Crawlspaces.php
California State Parks
http://ohp.parks.ca.gov/?page_id=25935
Environmental 360
http://e360.yale.edu/feature/green_architecture_building_retrofits_tap_energy_saving_potential/2461/
U.S. Department of Housing and Urban Development
http://archives.huduser.org/scrc/sustainability/newsletter_072512_3.html