Sources
Appendix I.7. Sketches for I due zoccoletti

Appendix I.7.B.1

4 bars noted on the verso of a handwritten poem which (according to the printed letterhead) is by “S. Di Giacomo / 92 Magnocavallo”,Note: *This was perhaps Salvatore Di Giacomo (1860-1934), a Neapolitan poet, playwright, and journalist.  clearly headed in Puccini’s hand as: “Zoccoletti”.