Research Project on Economical Apartment Design, 1930: Building type IIb: basement plan, 1:50

Colored marker on paper

Colored marker on paper

Graphite on paper

Watercolor on brown wove paper

Black marker on paper

Colored marker on paper

Black crayon on paper

Colored marker and black pen on paper

Black ink, graphite, and watercolor on off-white wove paper

Black and colored crayons on paper

Graphite on paper

Colored marker on paper