Research Project on Economical Apartment Design, 1930: Ia, Ib: section and estimate

Black marker, black pen, paper, and adhesive on paper

Green, gold and gray crayon on paper

Graphite on paper

Colored marker on paper

Black marker on paper

Black crayon on paper

Graphite and colored pencil on paper

Black crayon on paper

Graphite on paper

Black marker on paper and adhesive on paper

Colored marker on paper

Graphite on paper