Untitled (bleed-through of previous page, left page); Untitled (bridge [over Main River in Frankfurt], right page)

Black and red marker on paper

Colored marker and blue pen on paper

Black ink on off-white wove paper

Oil paint on offset lithograph, 1989 edition of Flora de la Real Expedición Botánica del Nuevo Reino de Granada (1783-1810)

Graphite on translucent wove paper

Graphite on paper

Graphite, watercolor and gouache with gum heightening in lower corners, on cream paper, laid down

Charcoal on paper

Tempera, charcoal and graphite on off-white wove paper

Black ink and white gouache on heavy white paper

Colored marker on paper

Graphite and red-orange crayon on paper