Louis Agassiz (American, 1807 – 1873)
Louis Agassiz (American, 1807 – 1873)
Albert Henry Munsell (American, 1858 – 1918)
Edward Penfield (American, 1866 - 1925)
Louis Agassiz (American, 1807 – 1873)
Charles Dana Gibson (American, 1867 - 1944)
Charles Buckles Falls (American, 1874-1974)