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  Zubrin, Robert. The Case for Mars. New York, NY. The Free Press, 1996.

Ronald Greely and Peggy Thomas. Mars Landing Site Catalog. http://cmex.arc.nasa.gov/MarsTools/Mars_Cat/Mars_Cat.html. January 21, 1999.
 

Compton's Encyclopedia.  Chicago, IL.  1992
 

Encarta 98. CD-ROM. 1998.
 

Brambilla, Roberto and Long, Granni.  Learning from Baltimore.  Institute for Environmental Action.  1979.
 

"1990 US Census Data".  Census Lookup (1.4a).  http://www.census.gov.  (11 Feb, 1999).
 

Smith, Beth.  "Who's Who in Residential Architecture".  Sun Magazine.  1994.