By suntotheworld
Carel Adolph Lion Cachet (Dutch, 1864 – 1945)
Giovanni Mataloni (Italian, 1869–1944)
Anonymous
A.W.B. Lincoln (American, 19th/20th Century)
Georges Antoine Rochegrosse (French, 1859-1938)
Oscar Straus (American, 19th/20th century)
Gene Buck (American, 1885-1957)
NASA (American, 1958 -)
Artcraft Lithograph (American, 1905–1970)
Artcraft Lithograph (American, 1905–1970)
Artcraft Lithograph (American, 1905–1970)
National Institutes of Health (American, 1887-)
National Institutes of Health (American, 1887-)
National Institutes of Health (American, 1887-)
National Institutes of Health (American, 1887-)
André De Takacs (Hungarian, 1880-1919)
Anonymous
Adolph Treidler (American, 1886–1981)