David: Thanks so much for this lead! I contacted the Archive. They have four papers by J. Babb. The two most likely to contain info on Capt. Mortimer are a paper on the decline of the Salmon fishery, or a paper on the history of the Pike family. Was it the Pike family history that you read? I’ve often seen your family name in my research. You have deep roots!
-Regards, David Roones