Lin's very helpful note prompted a quick inspection of my copy, which is not
annotated or marked in the text proper, other than a bookbinder's code mark
in the gutter of leaf B1r.  I skimmed the book again, looking for any marks,
sneezum, tobacco leavings, or folded down pages, and found nothing. But this
book was issued uncut, unopened, and every single leaf in Twain's copy was
opened. While some other member of the family could have opened and read the
pages, it's worth noting that (usually) Twain did not bother to open leaves
that he didn't want to read, as evidenced by more than a few books from his
library were a portion of a book was opened and even marked, while the rest
of the book was left unopened. The book does show moderate use from
handling, which is significant because it was handled very little after it
was sold to Estelle Doheny in 1940 by Max Hunley, a dealer who was acquiring
things from Clara at the time.

Kevin Mac Donnell
Austin TX