. . . . . . . . . . . "Statistics" . "Statistics"@en . . . . . . . . "Wilderness visitors and recreation impacts : baseline data available for twentieth century conditions" . "Wilderness visitors and recreation impacts : baseline data available for twentieth century conditions"@en . . . . "Wilderness visitors and recreation impacts: baseline data available for twentieth century conditions" . . "Wilderness visitors and recreation impacts baseline data available for twentieth century conditions" . "Wilderness visitors and recreation impacts baseline data available for twentieth century conditions"@en . .