Rock form

1970
Litograph, ed. L-XV/XXXV, editor Galerie Wolfgang Ketterer, Munich, printer Mourlot, Paris
26 X 20 cm
Signed in pencil lower right and numbered lower left
PROVENANCE:
Galleria d'Arte Narciso, Turin (label on the reverse)
Private collection, Milan
LITERATURE:
F.Man, G.S.-das graphische werk 1922-1970, Munich, 1970, n. 102