The book concludes with an appendix which includes some notes on the music notation, as well as two pages of photographs of the Paolo Soprani accordions used by Paddy O'Brien during his musical life and also a copy of a letter to Paddy from Paolo Soprani in Italy regarding the model he had custom-built for him in 1961.
Button accordions made by Italian craftsmen and sold to the Irish market in New York City are the subject of a research project that grew out of a lecture I give on the McNulty family.