National Silviculture Workshop (2001 : Hood River, Or.)
Portland, Or. : U.S. Dept. of Agriculture, Forest Service, Pacific Northwest Research Station, [2002]
2002
Hummel, Susan Stevens, author.
Portland, Oregon : U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station : Xerces Society for Invertebrate Conservation, October 2012.
2012-
Hummel, Susan Stevens, author.
Portland, OR : United States Department of Agriculture, Forest Service, Pacific Northwest Research Station, June 2015.
2015-