Notes and diagram of the Legend of the True Cross by Piero della Francesca

Graphite and yellow crayon on paper

Black ink and white-gray gouache on grayish-white textured wove paper

Graphite on discolored off-white wove paper

Watercolor and graphite on white wove paper

Watercolor over graphite on off-white wove paper

Charcoal on off-white laid paper

Acrylic on off-white wove paper

Graphite on off-white wove paper

Watercolor on heavy off-white wove paper

Graphite on paper

Graphite on paper

Watercolor, white gouache and graphite on off-white cardboard