includes Hovey, Horace C., Guide Book to the Mammoth Cave. 1890. Cincinnati: Robert Clarke & Co. 8vo, 70pp, paper covers, with illustrations and maps; AND Thompson, John, Mammoth Cave Kentucky: An Historical Sketch. 1909. (No publisher noted), 26pp, paper covers, with photographs, illustrations, and pullout map.
Condition: First with toning, broken spine, torn and "chewed" pages; second with light tinting and foxing to cover.