@Phil: thanks for chiming in. Yes, I assumed the Advices were Orthodox due
to being sold in the bookstore there by the Orthodox Arch Street
meetinghouse. I wish Swarthmore or someone compiled a list charting all of
the major Philadelphia printers and distributors and put it up on their
website.

For those confused about this conversation: Philadelphia Friends split into
two branches in 1827 and each was so sure of its rightful claim to
Quakerness that they both kept the “Philadelphia Yearly Meeting” name and
refused to acknowledge even the existence of the other body. They both
published books of discipline, advices, the journals of important ministers,
etc. To figure out who published what you often have to look at the printer
and know which side they were on. Very silly, hmm?