The Autograph Metrostyle series is interesting and always nice to turn up. Not particularly common, especially in 88-note form. Of coure, the roll's just an ordinary Themodist roll with a (slightly different) wiggly red line on it. The facsimile writing is often convincing enough that sellers say the rolls are signed in person, but don't be fooled!
Mussorgky's 'Pictures' as originally published in piano solo form is not commonly played. It was error-ridden and hacked-about in its 1880s printing, apparently, and a corrected form only came out in 1931 - for which gems of information I thank Wikipedia. Hence the number of dolled up versions, whether by Ravel for orchestra (1922) or by Horowitz for piano (1946). This probably explains its rarity on roll, although Prokofieff recorded two bits (Promenade & An Old Castle) on Duo-Art, available in the BluesTone reissue catalogue.
There are MIDI files available for the whole of 'Pictures', which would give a good start should anybody want them cutting. They'd need correction (probably) and generally fettling for roll (e.g. putting in theme accenting to make them musically efective on a player).
There is a smattering of other Mussorgsky on roll: chunks of Boris Godunov turn up from time to time, and recently I found roll 2 of a selection from Khovanshchina, an early Themodist 88-note roll that I don't recall having come across before - rather well arranged for piano, as well. Like many rolls issued just before WW1 it probably didn't stay in the cataloge very long.