National Hardwood Lumber Association (www.nhla.com)
National Wooden Pallet and Container Association (NWPCA.org)
Pennsylvania Forest Products Association (www.hlma.org)
Random Lengths (www.randomlengths.com)
The Pallet Enterprise (www.palletenterprise.com)
The Pallet Profile (www.palletprofile.com)
US Energy Information administration-Gas & Diesel
Purple Diamond Testing Laboratory (www.purple-diamond.com)
Western Pallet Association (www.westernpallet.org)