Trends in wilderness visitors and visits [microform] : Boundary Waters Canoe Area, Shining Rock, and Desolation wildernesses / David N. Cole, Alan E. Watson, Joseph W. Roggenbuck (Research paper INT ; RP-483)
Trends in wilderness visitors and visits [microform] : Boundary Waters Canoe Area, Shining Rock, and Desolation wildernesses / David N. Cole, Alan E. Watson, Joseph W. Roggenbuck