Winston Churchill's speech to the Scottish Unionist Association in Edinburgh, Scotland (September 25, 1924), later published in "Winston S. Churchill: His Complete Speeches, 1897-1963" edited by Robert Rhodes James (Volume 4, p. 3472), 1974.
John Muir (2015). “John Muir’s Incredible Travel Memoirs: A Thousand-Mile Walk to the Gulf, My First Summer in the Sierra, The Mountains of California, Travels in Alaska, Steep Trails… (Illustrated): Adventure Memoirs & Wilderness Studies from the Naturalist, Environmental Philosopher and Early Advocate of Preservation of Wilderness, the Author of The Yosemite and Picturesque California”, p.10, e-artnow