William Lloyd Garrison, Bruce Rogers (1905). “The Words of Garrison: A Centennial Selection (1805-1905) of Characteristic Sentiments from the Writings of William Lloyd Garrison”
Sir Charles Lyell, Gérard Paul Deshayes (1830). “Principles of Geology: Being an Attempt to Explain the Former Changes of the Earth's Surface, by Reference to Causes Now in Operation”, p.153