Nice set, I especially like the cactus and outhouse. The stones appear to be volcanic field stones similar the those used to construct buildings in the Wichita Mountains National Wildlife Refuge and Medicine Park Oklahoma (both near Lawton). If I recall the story correctly farmers trying to establish fields kept digging them up and finally started to build with them. Yes, they are volcanic. Despite their small size now the Wichita's are one of the oldest mountain ranges in the world. (According to one of my elementary teachers.)
Bill
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