NAT, Rien van der (1948-). (Serie abstracta). (N.d.) 3 coloured drypoints. 125 x 150 mm. each. All signed in pencil. Under 1 passepartout. -- José CALSINA (1936). (Trees). 1988. Etching. 100 x 145 mm. Signed, dated and numb. (139/250) in pencil. Under passepartout. -- Rein DOOL (1933-). "Toren van Babel". 1965. Lithograph. 170 x 280 mm. Signed, titled, dated and numb. (7/19) in pencil. Under passepartout. -- And 13 o. (smaller) works by Leiden artists (i.a. Mattie, Houwelingen, Fakkel, Buurman, Zuyderhout, Nooyer-Punder). (18).