Kennebunkport Historical Society
http://www.kporthistory.org/
125 North Street Kennebunkport, ME 04046
(207) 967-2751
Maine Historical Society
http://mainehistory.org
489 Congress Street #2 Portland, ME 04101
(207) 774-1822
Estate and Copyright Information:
[to my knowledge, this is who holds the rights to Kenneth Roberts’ works]
Key Trust Company of Maine, “successor as personal representative for the Estate of Kenneth Roberts to the Canal National Bank, Portland, Maine.”
Kenneth Roberts’ biography, Jack Bales, informed me that this is who he had to deal with when writing Roberts’ biographies.
Kenneth Roberts - The Unofficial Site 
It was my understanding that Dartmouth College has the Kenneth Roberts archive. Do you know if this is true? He (KR) and my grandfather were friends and I’d like to donate some book reviews, letter, etc. If they do not have the archives do you know who does?
Good evening! Thank you for your comment. You are correct that Dartmouth houses Kenneth Roberts’ archives.
I think that that it sounds very interesting about your grandfather and KR. Do you have any anecdotes you can share from your grandfather?
Thank you for your question!