The digital map collection now includes images from many research repositories in New Hampshire covering various areas of New England and New York. Digital maps from the Harvard University Map Collection are also included.
I found a gem in this 1941 survey of the Quincy, Massachusetts area which includes a view of the Fore River shipyard where many of my Tierney family ancestors worked.
Also researching Massachusetts? You might want to start with the Historic USGS Maps of Massachusetts Alphabetic Town Listing.
Thanks to Dick Hillenbrand of Upstate New York Genealogy for mentioning the map collection at Old Maps of New York Towns Online and to Randy Seaver of Genea-Musings for spreading the news about the Historic USGS Maps of New England and New York.