The image on the top detailing the area where the Mystic River and Chelsea Creek flow into Boston Harbor is from the 1892 Atlas of Massachusetts published by Geo. H. Walker & Co.
These atlases are a useful tool for genealogists, architectural consultants, and those researching the history of their homes, as they provide information about property boundaries, plot size, ownership and building shapes and materials. The image below, taken from the City atlas of Lowell, Massachusetts (published by G. M. Hopkins in 1879) illustrates properties, including mills and other industry along the Concord River in Lowell.
The Massachusetts real estate atlas digitization project, to be completed by the summer of 2013, has been developed with federal funds provided by the Institute of Museum and Library Services and administered by the Massachusetts Board of Library Commissioners.