Missing Markers: Comancheria

We were traveling between Lawton and Altus on US 62 (close to Snyder exit) last night and noticed the Comancheria / Quanah Parker markers are missing. We didn't get a chance to stop and look around. Does anyone have an information on their disappearance?

map: http://goo.gl/maps/Nl2zY

Update: You can even see the markers are missing on Google Maps street view. http://goo.gl/maps/nfkKr

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