Research Project on Economical Apartment Design, 1930: Section, 1:50

Graphite, watercolor, and ink on paper

Graphite on paper

Red marker and black pen on paper

Colored marker and blue pen on paper

Graphite and colored crayons on paper

Graphite on cream wove paper

Blue crayon on paper

Graphite on paper

Black marker on paper

Graphite and blur crayon on paper ; graphite on paper

Graphite on cream wove paper