b'Related case material to Etching Process 3 copper plates, drypoint and soft-ground etching (14 3/4 x 10 3/8 inches)One small bound notebook with color trials and notes6 uncatalogued proofs after Mary Cassatt, In the Omnibus, 1890-91Drypoint and soft-ground etching on paper23 x 20 inches58 59'