Challenge of the Century: Unknowns GC4H4BY
by Geo Walla Walla
Umatilla county, OR, United States
5.12 Points
256 finds in 13 years, 1 month
Next find points: 5.10
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First available: July 27, 2013
Last Update: August 28, 2026 11:52 AM
Last Full Sync: August 21, 2026 11:28 AM
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