Anonymous
Anonymous
Anonymous
Anonymous
Archie Gunn (American, 1863 - 1930)
Anny Dollschein (Austrian, 1893–1946)
Anonymous
Minka Podhajská (Czech, 1881-1963)
Henri Boulanger Gray (French, 1858-1924)
National Institutes of Health (American, 1887-)
Georges Meunier (French, 1869-1942)
National Institutes of Health (American, 1887-)
U.S. Information Agency (American, 1953-1999)
Ritchey Lith. Corp. (American, 19th/20th Century)
Anonymous
Pat Keely (English, 1901-1970)
Mariusz Zaruski (Polish, 1867-1941)
Caran d'Ache (French, 1858-1909)
Anonymous
Anonymous
Rudolf Kalvach (Austrian, 1883–1932)
Anonymous
Eric Rohman (Swedish, 1891 - 1949)