Allen County Public Library in Ft. Wayne, Indiana. The book is scanned in digital form on other websites (including BYU), but the inscription was a neat discovery which I've mentioned elsewhere.
I'm mentioning it again as subscriber Liz on our Facebook Fan Page mentioned that Sargent might have been an early member of NEHGS and that they have some information on early members. I'm going to see if there is anything there on Sargent--not because he's a really close relative, but out of curiosity and for something a little bit different to include in the newsletter. Thanks Liz for the suggestion.
I'm also really glad I decided to look at the copy of the Sargent Genealogy while in Ft. Wayne even though I already had downloaded a PDF file from another source. The inscription was really a great find.
Sargent, Aaron, and John S. Sargent. 1895. Sargent genealogy Hugh Sargent, of Courteenhall, Northamptonshire, and his descendants in England by John S. Sargent ... William Sargent, of Malden, New England, and his descendants in America by Aaron Sargent. Somerville, Mass: Sargent. This image from the print copy at the Allen County Public Library, Ft. Wayne, Indiana.