1. School of Public and International Affairs, Virginia Tech. 140 Otey St NW, Blacksburg, Virginia 24061, United States
2. B&D Engineering and Consulting LLC, 12100 Richmond Rd, Glencoe, Oklahoma 74032, United States
3. Langseth Engineering, 3860 Peakland Place, Lynchburg, Virginia 24503, United States
4. Restoration Bioproducts LLC, P.O. Box 20012, Roanoke, Virginia 24018, United States