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

Oil on green wove paper

Blue marker and black pen on paper

Graphite on paper

Black marker on paper

Graphite on paper

Graphite on paper

Colored crayon on paper

Graphite and blue crayon on paper

Colored marker on paper

Graphite on paper

Colored marker on paper

Black and colored crayon on off-white wove paper