by Robert Samuel Duncan

1882

by Edmund Robert Daniell

1901

by Robert Hardin Marr

1923

by Samuel Robert Smith

1892

by Robert Allen Campbell

1874

by Alfred James McClatchie, Edward Marshall Boggs, James William Toumey, Robert Humphrey Forbes, Theodore Dru Alison Cockerell

1897

by William Robert Shepherd

1921

by Robert Green Ingersoll

1873

by Edmund Robert Daniell, Richard White

1914

by Robert Clarkson Brooks

1901

by Robert Wallace

1907

by Hugo Paul Thieme, John Robert Effinger

1908