77/3568 Adsera Riba, E. (b.1939). "[illegible] triangles". Col. reliëf etching, 49x39 cm., signed "Adsera Riba", titled, "11/12" and "Zaandam 1985" in pencil. Idem. "Tres Cataidos". Tinted reliëf etching, printed in brown, 49,5x39,3 cm., signed "Adsera", titled, "prova 6/10" and "Zaandam 1977" in pencil, w. the artist's blindstamp. - AND 3 similar tinted etchings by the same (each signed).