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

Graphite and colored crayons on paper

Graphite on paper

Graphite and colored pencil on cream card

Black crayon on paper

Graphite and red crayon on paper

Graphite with blue crayon on paper

Colored marker and stamp ink on paper

Black crayon on paper

Colored marker on paper

Ink on vellum

Watercolor on paper

Black crayon on paper