For those who'd like to know:

Jesse's original fotdella was donated to the Smithsonian Institution's musical instrument collection. Although it is not on permanent display (for lack of room), it *is* available to be seen if you call in advance.
Jesse's only wife's name was Gertrude, so I'm afraid that other story isn't accurate.
Although there may have been a time when Jesse was not paid for "San Francisco Bay Blues," he (and later his widow Gertrude, and since her death their children) *do* now get paid full royalties for the song (as well as all his other original compositions), and have done so for many decades.
Finally, someone recently wrote an illustrated book of "The Monkey & The Engineer" for children, and I think (but check on amazon or wherever you're ordering it from first to be sure) that the book includes the music, as well as the lyrics.