signed and dated "BThompson 61" lower right

pencil, oilstick and ink on paper

image 7 1/4 x 6 5/8 in. (18.4 x 16.8 cm)
sheet 11 1/8 x 10 1/2 in. (28.3 x 26.7 cm)

Executed circa 1961–1962.