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by Barker, Graeme; Gilbertson, David; Mattingly, David
by U.s. Department of Agriculture; Forest Service; Calkin, David E.; et al.
by Graeme Barker; David Gilbertson
by David Gilbertson
by Gilbertson, David; Butcher, Bill
by Lewis, Kevin; Gilbertson, David Michael
by Kevin Lewis; David Michael Gilbertson
by Gilbertson, David