Being old, I can speak from experience about 78's and picture sleeves. They didn't exist, as far as I know. 45 r.p.m.'s had picture sleeves... I have several Beatles 45's with the picture sleeve, but that was a fairly modrun idea.

I have many Carter Family lps, though. Just sorted through them recently..

I also picked up a book... Will You Miss Me? on remainder, which is a wonderful biography of the Carter Family, including many photographs.
It's well worth the read.

Jerry