17-Feb-19

D.C. “Jasper” Carlton and Clait E Braun. Biodiversity Legal Foundation. August 18, 1999.

Mark Hill and William S. Platts

University of New Hampshire Cooperative Extension

Carly Bare, Katie Davidson, Lindsey Freeburn, Ellen Patten and Suzanne Ewy. Coldharbour Institute and Western Colorado University. May 2016.

Ralph E. Clark III. USDA Soil Conservation Service. October 1974.

Ralph E Clark

Cynthia Peterson. February 5, 1999.