. . "Conservationists." . . "Conservationists California Biography." . . "California." . . "Conservation of natural resources California History." . . . . . "Biography"@en . . . . . . . . . . "History"@en . . . . "Sierra Club executive director : the evolving club and the environmental movement, 1961-1981"@en . . . . . . . . . . "Sierra Club executive director the evolving club and the environmental movement, 1961-1981"@en . . . "Conservation of natural resources." . . "Sierra Club" . . "Sierra Club." . "Bancroft Library. Regional Oral History Office." . . "Conservation of natural resources United States." . .