Current USGS topo maps should show this information.
http://docs.unh.edu/nhtopos/Winnipesaukee.htm
This site has scans of older topo maps. I don't think the city and town boundaries would have changed much, so the 1956 series should be fine for your needs.
Once they finish loading, you can click on the little button in the lower right hand corner to expand the map.
Rob