hi grady

not sure what you have photographed and what you haven't ...
you might check out the society for industrial archaeology
they have a southern and northern new england chapter.

you might also drive around the blackstone river corridor between providence and worcester - ( all along rt 146 ) lots of abandoned buildings big and small in towns & mill villages on that road or nearby, or if you are going towards new hampshire check out "stuff" east of rt 93 along the merrimack river ... not just lowell or lawrence, but the small towns in mass and new hampshire have all sorts of mill/factory and generally speaking abandoned "stuff".