Geological time.

Overview
Works: 25 works in 7 publications in 7 languages
Titles
How do we know the age of the earth / by: (Language materials, printed)
A Geologic time scale 1989 / by: (Language materials, printed)
A geologic time scale 2004 / by: (Language materials, printed)
Earth cycles = a historical perspective / by: (Language materials, printed)
Earth cycles : = a historical perspective / by: (Language materials, printed)
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