Encyclopaedia Britannica, 11th Edition, Volume 17, Slice 2, by Various 43254 [Subtitle: "Luray Cavern" to "Mackinac Island"] [Link: http://www.gutenberg.org/4/3/2/5/43254 ] [Files: 43254.txt; 43254-8.txt; 43254-h.htm] Thanks to Marius Masi, Don Kretz and the Online Distributed Proofreading Team at http://www.pgdp.net David