In 12° (mm 180x105); two parts in one volume with sequential numbering; pages IV, 458, (4) of the catalog of prints + 15 (out of 16) plates of plants engraved in copper outside the text and all folded several times (the one from the Regola district is missing, plate IX, supplied in photocopy). Contemporary marbled paperback binding covered in green paper (abrasions and signs of aging). Numerous ancient vertical signs on the sides of the text. Rare guide to Rome by Magnan, reprinted by Losi in the same year as the first and in 1783, originally published anonymously in Rome by Arcangelo Casaletti in 1778, first in 8° and then in a folio version and distributed in Saint Eustache by Bourchard and Gravier. See Barbier IV, 1034 for the Author; Rossetti, G-1285; Schudt 363.