Branch and Mathematical Notations; verso: Branch and Pentagon

Red, black, white and yellow chalk, with the red chalk moistened with water or oil, white and red opaque watercolor on oatmeal paper, framing line in black ink, laid down

Transparent watercolor, brown ink, brown wash and touches of opaque watercolor over graphite on cream antique laid paper

Black and red chalk on off-white antique laid paper, framing line in brown ink; verso: red chalk offset with random black chalk smudges

Watercolor and black ink on beige antique laid paper, mounted overall; framing line in brown ink

Black chalk, gray wash, brown ink and white opaque watercolor, incised, on cream antique laid paper, partial framing lines in brown and black ink

Brown ink and brown wash over black chalk on off-white antique laid paper; verso: incidental red chalk

Brown ink and gray and blue watercolor on cream antique laid paper, partial framing line in brown ink

Brown ink and gray wash on off-white antique laid paper, framing line in black ink

Black and white chalk on blue paper; verso: brown ink and black chalk

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

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

Black and white chalk and charcoal on light gray antique laid paper discolored to tan