Mostly etched copies in reverse of 40 of the 50 illustrations in: Disegni di vari altari e cappelle nelle chiese di Roma ... date in luce da Gio. Giacomo de Rossi nella sua stamparia in Roma alla Pace. This work is first mentioned in the de Rossi Index of 1689; see Indice delle stampe de' Rossi, p. 400.
In the present variant, illustrations XVIII and XIX are printed on separate sheets.
Approximate date of publication based on publisher's years of activity. See VD17.
Etched throughout, including title sheet. All illustrations, including the title sheet, are numbered (from I to XXXIX). The "Index figurarum", on sheet XL, identifies churches, architects, patrons, etc.