Challenge of the Century: Letterbox Hybrids GC4H4DR
by Geo Walla Walla
Umatilla county, OR, United States
6.76 Points
196 finds in 13 years, 3 months
Next find points: 6.73
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First available: July 28, 2013
Last Update: October 23, 2026 2:58 PM
Last Full Sync: August 21, 2026 11:29 AM
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Statistics last updated Thursday, 29 October 2026 04:30:50 Eastern Daylight Time
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