(1976)
offset-lithograph
(1934)
lithograph
(1928)
(1983)
hand-written letter
(1982)
(1971)
envelope
(1970, Feb-May)
(1970)
photocopy
(1995, October)
(1975)
(1981)
ink stain
(1935)
pen and blue ink
(c.1975)
fibre-tipped pen