1
Published: 1967
Superior document: Sammlung Walter Niggeler Auktion in Basel 4
2
Published: 1966
Superior document: Sammlung Walter Niggeler Auktion in Basel 2
3
Published: 1967
Superior document: Sammlung Walter Niggeler Auktion in Basel 3
4
5
Published: 1965
Superior document: Sammlung Walter Niggeler Auktion in Basel 1