1975
Fred Sandback, 1969
Turtell, Neal, Mr., 1985
Turtell, Neal, Mr., 1975
Fred Sandback, 1990
Hamburg Griffelkunstvereinigung, 1975
Turtell, Neal, Mr., 1992
Fred Sandback, 2001
Turtell, Neal, Mr., 1960
Turtell, Neal, Mr., 1974
Turtell, Neal, Mr., 1993
Fred Sandback, 1989
