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The cache is NOT at the posted coordinates, but it is somewhere in the land of N38/W121. Solve the puzzle to find the location of the physical container.
Welcome back to the Landslide series. When you sign the log sheet, notice the number on top. You'll need it for the final cache in the series. As for this one, I'm getting older.
You can validate your puzzle solution with certitude.
Wow, this cache was featured on teamajk's Geocaching Puzzle of the Day for January 27, 2018!
(No hints available.)