The Evolution of the Conservation Movement in the United States Before the Creation of the National Park Service

• Selected Events in the Development of the American Conservation Movement, 1847-1920
• Life Among the Indians by George Catlin
• Letters and Notes on the Manners, Customs, and Conditions of North American Indians by George Catlin (1844)
• The Man and Nature; or Physical Geography as Modified by Human Action by George P. Marsh (1864)
• The Yosemite and the Mariposa Grove: A Preliminary Report by Frederick Law Olmstead (1865)
• The Yellowstone National Park by Hiram Martin Chittenden (1895)
• The Writings of John Muir
• The Mountains of California by John Muir (1894)
• Report of the Public Lands Commission (1905)
• Report of the Public Lands Commission (1905)
• Proceedings of a Conference of Governors (1908)
• Addresses and proceedings of the First National Conservation Congress held at Seattle, Washington, August 26-28, 1909.
• The Fight For Conservation by Gifford Pinchot (1910)
• My First Summer in the Sierra by John Muir (1911) 
• List of National Park Publications (1912)
• The Yosemite by John Muir (1912)
• Our Vanishing Wildlife: Its Extermination and Preservation (1913)
• The Story of My Boyhood and Youth by John Muir (1913)
• National Park Service. Hearing before the Committee on the Public Lands, House of Representatives (1916)
• Proceedings of the National Park Conference, vol. 4 (1917)
• The Letters of Franklin K. Lane, Personal and Political
• Frederick Law Olmstead National Historic Site
• John Muir National Historic Site
• Sagamore Hill National Historic Site (Theodore Roosevelt)