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

Blue crayon on paper

Graphite and blue crayon on paper

Colored marker on paper

Graphite and ink on paper

Graphite and black crayon on paper

Graphite on brown wove envelope

Graphite on paper

Black crayon on paper

Graphite on paper

Colored marker and blue pen on paper

Colored marker on paper

Charcoal on cream wove paper