1865 | graphite on paper
1885 | printing ink on paper
June 1873 | graphite on paper
1879 | printing ink on paper
1886 | graphite on paper
1880 | printing ink on paper
August 9, 1873 | graphite on paper
1893 | graphite on paper, red chalk on verso
July 12, 1873 | graphite and ink on paper
1888 | ink on notebook paper
August 5, 1873 | graphite on paper
1879 | brown printing ink on paper
1888 | brown printing ink on paper