Giambattista Piranesi (1720-1778 )Veduta delle fonte et delle Spelonche d'Egeria... (The Spring and the Cave of Egeria). 1766. Etching and burin. 690 x 405 [760 x 540]. Hind 80 (iii/v). Very fine proof on strong laid paper, before the numbers on the right. Folio number 64 in pen and sepia ink in the upper right corner. Left edge irregular, ragged, with small binding miter holes and missing. Large margins. 1st Parisian edition.