

William Guy Wall (American, 1792-1864)






John Glidden (American, 19th/20th century)










John Howard Appleton (American, 1844 – 1930)

Charles Willson Peale (American, 1741-1827)


Cornelius Christoffels (American, 1879 - 1960)


Udo Keppler (American, 1872 – 1956)



Louis Agassiz (American, 1807 – 1873)
