I'm sure that this has been covered many times before, but...
On page 13, written in F, it clearly contradicts the statement that "all banjo music is written in two keys." I checked that Weidlich book and he just puts it in G. What gives?
The music typesetter ran out of "sharps" ?
OK - I admit this thought popped into the smart-ass part of my brain, and it's probably not true, but it looks like Briggs' was set with moveable type (not engraved) in which case the printer would have had a finite number of sharps with which to do the job. This is a by-product of having misspent part of my youth working in the printshop at a living history site - we were always running out of things. Yeah - It's pretty far-fetched.