Washington : Washington State University, 1979 .
vi, 298 p.

By Hawksworth, Frank G., .
Washington D. C. : Forest Service, 1972 .
234 p.

By Medina, Ernesto.
Washington : OEA, 1977 .
vii, 102 p. 77XXIIB002S

By Garrahan, Patricio J..
Washington : OEA, 1977 .
vi, 80 p. 77XXIIB008S

By Bianchi, Néstor O..
Washington : OEA, 1978 .
viii, 98 p. 78XXIIB009S

By Sáez, Francisco A..
Washington : OEA, 1978 .
vi, 124 p. 78XXIIB0115

By Rabinovich, Jorge E..
Washington : OEA, 1978 78XXIIB012S

By Lugo, Ariel E..
Washington : OEA, 1982 .
vi, 82 p.

By Crisci, Jorge Víctor.
Washington D.C : OEA, 1983 .
vi, 132 p. 0827017170

Washington D. C. : Wilderness Society; 1986 .
vi, 116 p.