Sketchbook: Partial Manuscript for "Otto Piene: Werkverzeichnis der Druckgrafik 1960-76"

Black marker on paper

Colored marker on paper

Colored marker and black pen on paper

Black ink, graphite

Blue marker and black pen on paper

Colored marker on paper

Graphite and colored pencil on paper

Graphite on paper

Colored marker and blue pen on paper

Green and brown crayon on paper

Ink on paper

Black crayon on paper