4to , 28.5 x 21 cm, 1st edition, ex libris embossed of DEREK Gibson blank, engraved titel page, VIII, 492 ,6 folding clean plates, blank pages contemporary calf, uncut Quite fresh and crisp copy rebacked with red morocco label, corners repaired engraved title with large vignette, head-pieces & initials and 6 folding plates, errata leaf, old ink signature to title, light marginal soiling or foxing, Rome, Paolo Giunchi Komarek, 1768. good reference book