Rotterdam: Galerie Delta, 1967. First Edition. Square quarto. An impressive exhibition catalogue from Rotterdam's Galerie Delta, founded by Hans Sonnenberg in 1962. Thoroughly-illustrated after photographs of named artists' works, along with two variations of Warhol's Flowers in color; Warhol, somewhat mysteriously, not named in the catalogue title list of artists in the exhibition. This copy also includes a print of Warhol's Self-portrait (8.5 in. square) printed in black on silver foil, with laudatory text to verso from Sonnenberg; hand-numbered in pencil as 30 of 75. The same numbering (and "met prent" designation) in pencil to verso of rear wrapper. Text in Dutch. A fine copy of a scarce catalog. With 3 OCLC records located; none in North America.