Pictorial representations Lincoln’s deathbed

[Eva Elisabeth]

Wow, Kees! I've once tried this, but less successfully (two ?? were left).
I just spotted Dr. Robert K. Stone is 7.+15 in your list. Don't know if this helps, these are the names on the bottom of the Berghaus engraving as I could figure out:
-left half:
Mr. J. Ulike - Mr. H. Ulike - Mr. G. Welles - Mr. Farnsworth/Mr Farnsworth Jr. - Chief Justice Chase/Surgeon Stone (?) - Mr. Colfax - Postmaster Dennisson (?)

-right half, from the left:
Mr. Proctor - Mr Peterson - Charles Sumner - Robert Lincoln - ...F....(???)/Surgeon General Barnes - ? (General Meigs?) - Surgeon Crane - General Halleck - Mr. Safford - Mr. Stanton