9780833078513 | Rand Corp, March 12, 2013, cover price $26.95

9780525951018 | E P Dutton, February 5, 2009, cover price $25.95 | About this edition: A geography scholar and artist recounts his research into ungoverned regions of the world where the military conducts some of its most clandestine operations, in an account that includes coverage of his investigation into a covert site in Nevada near where a construction worker was poisoned by toxic chemicals.

9780833034328 | Rand Corp, April 1, 2004, cover price $24.00

9780833030191 | Rand Corp, June 1, 2001, cover price $20.00

9780932813374, titled "Underground Bases and Tunnels: What Is the Government Trying to Hide?" | Adventures Unlimited Pr, December 1, 1996, cover price $15.95 | About this edition: Book by Dr.

9780964497900 | Dependable Type, February 1, 1995, cover price $13.95 | About this edition: Sauder's book is an inquiry on the massive underground operations and bases that exist in various locales throughout the United States, and remains an interesting and thought-provoking read.

9781556138485 | Heritage Books, November 1, 1993, cover price $25.50

9780313231339 | Greenwood Pub Group, July 1, 1985, cover price $75.00 | About this edition: [An] excellent source of detailed information about both famous and obscure places in U.

9780879913595 | Reprint edition (Porcupine Pr, June 1, 1975), cover price $35.00