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This is an interesting survey item.
To log your find please email me with answers to the following questions (don't wait for an answer to post. I will only contact you if you are wrong): 1. What is OPO short for? 2. What person officiated over the placment of this? 3. When was it placed? Please feel free to put your GPS in the correct Datum and verify your accuracy while you're there!
(No hints available.)
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Coordinates are in the WGS84 datum