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"The Book of Buried Treasure" by Ralph D. Paine, 1911

Being a True History of the Gold, Jewels, and Plate of Pirates, Galleons, Etc.,which are Sought For to This Day. Illustrated.

"Underground or Life Below the Surface." by Thomas W. Knox, 1876.

"Incidents and Accidents. Beyond the Light of Day; Startling Adventures in All Parts of the World; Mines and the Mode of Working Them; Under-Currents of Society; Gambling and its Horrors; Caverns and Their Mysteries; The Dark Ways of Wickedness; Prisons and Their Secrets; Down in the Depths of the Sea; Strange Stories of the Detection of Crime."