David W. Bartlett, Abraham Lincoln (1860). “The Life and Public Services of Hon. Abraham Lincoln: With a Portrait on Steel. To which is Added a Biographical Sketch of Hon. Hannibal Hamlin”, p.190
Roderick Impey Murchison (1854). “Siluria the History of the Oldest Known Rocks Containing Organic Remains, with a Brief Sketch of the Distribution of Gold Over the Earth by Roderick Impey Murchison”, p.5