Hi everyone, i ended up here because im trying to learn more about our family farm. In looking over some old usgs topo maps i came across three buildings i hadn't known were there. An aerial photo from 1952 seems to suggest someone was squatting on part of the land. One thing I haven't been able to piece together is a large red dot near the buildings? I can't find a key that will tell me what it means? Its only there until 1966. Any idea what it could be?