I stumbled across this today!
The National Museum of American History archive database.
I have not found anything related to Emmett or my peripheral research in the NMAH archives yet — but I have only just begun to search!
One of the best collections here is the Balm of America Patent Medicine Collection. Many of these items were certainly things that we’d have seen in Emmett Wilson’s bathroom medicine cabinet! Check it out!
The University of Maryland Global Campus