2. Amsterdam, Van Gelder , s.d. ( ca. 1960 ), in-4°, 79 pp, sewn, original lithographed cover. This publication by the famous Dutch manufacturers of high quality printing paper is made of different specimen of paper and printed with different printing techniques. It is illustrated with some beautiful full page abstract colour lithographs by J. van Keulen. Fine copy notwithstanding a small (2 cm²) damage spot on the frontcover due to the removal of a price label.