Here are some guidebooks about commercial caves.
The books tell the tourist useful information for the visit of public caves.
On the other hand: you reallly do not need those books!
showcaves.com is much better!
Russell H. Gurnee, Jeanne Gurnee (1980):
Gurnee Guide to American Caves,
A Comprehensive Guide to the Caves in the United States Open to the Public
Zephyrus Pr, Longman Trade/Caroline House, (June 1980), hardcover.
A marvellous book about American show caves. at Amazon.com
Jerry Sinise, Dorothy Sinise (1983):
Texas Show Caves,
Eakin Publications; ASIN: 0890153779; (June 1983)* Paperback: 120 pages at Amazon.com
Tony Oldham (1972):
A Guide To The Show Caves Of Britain
Shire Publications; ASIN: 0852631553; at Amazon.com
Bruce Bedford (1986):
A Guide to the Wild Caves and Show Caves of England, Scotland and Wales
HarperCollins; ASIN: 0002181010; (September 1986) at Amazon.com
Joy M. Lyons (2001):
The Story Behind the Scenery
KC Publications, ISBN: 0887140505, (July 2001), paperback, 48 pages at Amazon.com
James D. Borden, Roger W. Brucker (2000):
Beyond Mammoth Cave,
A Tale of Obsession in the World's Longest Cave
Southern Illinois Univ Pr (Txt), ISBN: 0809323451, (November 2000), hardcover, 416 pages at Amazon.com