the complete set of sixteen etchings with aquatint in black and red, on Crisbrook Royal Hotpress paper, 1961-63, each signed in pencil and numbered 49 of 50 (there were also ten artist's proof sets), published by Editions Alecto in association with the Royal College of Art, London, loose (as issued), with the title, artist's statement and justification pages, each with full margins, in very good condition, together with the original red linen-covered portfolio and black slipcase, with the title in gilt, framed