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The Dover Historical Society is hosting a free lecture, “Routine Maintenance Advice for Owners of Historic Homes,” Thursday at 7:30 p.m. in the lower level of the Dover Town Library on Dedham Street. Joseph Cornish, supervising preservation services manager at Historic New England, will speak about the importance of routine maintenance, and what to look for when inspecting the condition of historic buildings. Cornish has worked to save many endangered properties, and administers and enforces the preservation restrictions that the nonprofit organization holds on 87 sites across New England.