Branch and Mathematical Notations; verso: Branch and Pentagon

Brown ink, gray wash, and green watercolor over graphite on cream antique laid paper, triple framing line in graphite

Brown ink and gray wash and incidental white opaque watercolor on off-white antique laid paper, inlaid on a mount

Black and white chalk on blue antique laid paper, faded to green-brown, mounted down

Brown wash, black chalk, and touches of white chalk on blue antique laid paper, framing line in brown ink; verso: brown wash and black and white chalk, framing line in brown ink

Brown ink, brown wash, and white and gray opaque watercolor over black chalk on off-white antique laid paper, partial framing line in graphite and mounted overall to wove paper

Brown ink, transparent watercolor, and graphite on antique laid paper

Brown ink over touches of black chalk on off-white antique laid paper, framing line in brown ink.

Black and red chalk on light brown toned antique laid paper

Brown ink and brown wash over black chalk, partial squaring in black chalk, on cream antique laid paper, laid down

Red chalk counterproof on cream antique laid paper, laid down on antique laid paper

Brown ink on off-white antique laid paper; verso: graphite

Brown ink and brown wash over graphite on cream antique laid paper