Certificate (plate 14) from The International Anthology of Contemporary Engraving: The International Avant-Garde, Volume 5: America Discovered (Anthologia internazionale dell'incisione contemporanea: L'Avanguardia internazionale: Volume 5: Scoperta dell'America)

Photograuvre and etching from an album of 16 etchings (one with aquatint, one with drypoint, one with pencil additions), three photogravures (two with etching), and one relief halftone | 11.4 x 15.2cm | 1962, published 1964