The originals of the letters in vol. 1 are in the Biblioteca Bresciana, Brescia, and the Biblioteca civile di Bergamo; those in vol. ii-iii, in the Biblioteca di Bassano (raccolta Ferrazzi)
Consists, in part, of extracts and reprints from Fiammazzo's "Raccolta di lettere inedite, 2. ed. ultima serie, "Udine, Del Bianco, 1898. Appeared also in part in the Giornale dantesco as follows: letters vi-xliv, xlvi-xlix, li-lii, in v. 8, p. 323-341; l in v. 9, p. 4-5; lxxvi-lxxviii, lxxxi, xciii, in v. 4, p. 73, 119-121, 420-424; xci-xcii, cv-cvi in v. 6, p. 312-316, 123-126; c, ciii, civ in v. 5, p. 130-132.
Nos. vi-xliv, "Da lettere di fra B. Lombardi al padre F. Piatti di Bergamo" (extracts from letters written while Lombardi was preparing his edition of Dante) and no. xlvi-xlix, li-lii, letters from S. Grosso to Fiammazzo, appeared in Giornale dantesco, vol. viii, under the title "Per la fortuna di Dante."