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Toad with Nails (1991)
Black and White Lines, Vertical, Not Touching (1970)
Lines, Not Long, Not Heavy, Not Touching (1970)
Brown/Black Zone Print (not dated)
Untitled (1975)
Untitled (not dated)
Between the Lines (not dated)
PW-2 (1999)
PW-84-II (1994)
OP 44 (c. 1970)
Untitled (1988)
Untitled (study) (1990)
Full Moon (1980)
Untitled Z-48 (1989)
For Tulips, June 6, 1986 (1986)