Branch and Mathematical Notations; verso: Branch and Pentagon

Brown ink and brown and gray wash over black chalk on cream antique laid paper, framing lines in black ink over black chalk

Brown ink and gray and blue wash over black chalk on off-white antique laid paper, partial framing line in graphite laid down

Black and white chalk on coarse, gray-brown antique laid paper, darkened and laid down on heavy rag paper

Black, red, and white chalk and brown and gray wash on cream antique laid paper, laid down

Black chalk, white opaque watercolor, and brown, gray, and red transparent watercolor on light tan antique laid paper, partial framing line in brown ink, ; verso: red chalk and transparent watercolor

Brown ink, brown and gray wash over black chalk on antique laid paper, mounted on album leaf

Brown ink, black chalk and white opaque watercolor on off-white antique laid paper, partial framing line in brown ink, possibly autograph

Black ink, gray and green wash, and white, gray, and yellow opaque watercolor over black chalk on buff antique laid paper, framing line in brown ink, laid down on thick laid card

Black chalk on gray antique laid paper; verso: black chalk

Brown ink, brown wash and black chalk, squared in black chalk, on cream antique laid paper, partial framing line in brown ink; verso: brown ink

Black and white chalk on blue faded antique laid paper

Charcoal and touches of white chalk on off-white antique laid paper, mounted down