Untitled (sketch of shipyard along the Weser River in Minden, Germany, left page); Untitled (portrait of the artist's older brother [Reinhold], right page)

Ink and watercolor with graphite color notations on paper

Black marker and black pen on paper

Colored marker on paper

Black and red marker on paper

Solvent on printed paper

Graphite on paper

Graphite on paper

Graphite on paper and mounted

Black crayon on paper and mounted

Colored marker, postcard cutouts, and adhesive on paper

Black, blue, and yellow crayon ; graphite on paper

Graphite, partially erased, on white wove paper