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12/13/93 — Tony Fiorillo (text, photographs, layout)

12/6/93 — David Polly (graphic art)

11/26/94 — Allen Collins (added time machine and authors icon)

3/08/97 — Brian Speer (rewrote text, added new chart of geological eras)

5/2000 — Colleen Whitney (constructed new introductory page)
7/7/2000 — David Smith (modifications to introductory page; new banner)

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