After September 1912, Hupfeld repeatedly published supplements to the general catalog, numbered I-VIII. Probably in 1914, Supplement A then replaced all of these supplements. This is Hupfeld’s most extensive supplement catalog for the 73-note Phonola music rolls, with 180 pages. It begins with corrections to the general catalog, price adjustments and title deletions. After that, the music rolls are sorted by composer and then by number, up to number 17780. We offer a PDF copy of this rare catalog for research purposes on request. If you are interested, please send us a message via our contact form.