Mary Thilly from Baileys Harbor, Jack Finger from Ellison Bay, Roy Thilly from Baileys Harbor, and Ralph Blankenburg from Sister Bay, Door County Land Trust work at Three Springs Nature Preserve to control non-native scotch pine. Scotch pine is a coniferous tree in the pine family (Pinaceae). Tuesday May 17 in Sister Bay, Door County, WI. Photo by Len Villano.