12.B.1
Location:
Last in private collection of the Della Nina family, Chicago (a digital reproduction of the photocopy of the source is available at I-Lgp).
1 double-sided leaf, 2° with 12 staves, 33 bars.
No. 4 in Bernardoni 2017a, p. 99, also including a transcription of the first 9 bars of the source.