I'm still a bit reeling from yesterday's trip to East Haddam. My search for the Graves family turned up completely empty handed. It's time to look for back up options... maybe Colchester or the State Library. In the meantime, it's back to Durham.
There isn't one "perfect" source for Durham photos online, but there are few websites that do a very good job. Historic Buildings of Connecticut offers an overview of Durham's historic homes. As always, Ebay has some great postcards. And if you have patience, you can find the National Register of Historic Places application - it's buried on the Durham Public Library's original website (which was replaced in April). Hopefully it will be easy to find again soon.