1879 | printing ink on paper
1885 | printing ink on paper
1879 | printing ink on paper with addition of wash
late 19th century | graphite on paper
1885 | printing ink on parchment
April 28, 1890 | graphite on paper
May 1, 1890 | graphite on paper
May 23, 1890 | graphite on paper
mid-19th century - early 20th century | graphite on paper
1890 | printing ink on paper
late-19th century - early 20th century | graphite on paper
late 19th century | graphite on tracing paper