Helpful Information

Dr. Bill  "Ask Dr. Math."  The Math Forum  May 1997   (January 1999)

Lanius, Cynthia  "Map Scale."  Math Topics. 1996 (December 1998)

Lanius, Cynthia  "What are Maps?"  Math Topics. 1996 (December 1998)

Pollastri, F.  "The Time of Internet."  (January 1999)

"World Time Scales."  NIST Physics. (January 1999)

Dickenson, Mary, ed.  Our World.  Washington, DC:  National Geographic Society, 1993

The New Book of Knowledge.  Continental Drift.  pp. G: 111-113

The World Book.  Continental Drift.  pp.P: 564