Image from Wikimedia Commons
unknown - Public Domain
Erling Mandelmann - CC BY-SA 3.0
Underwood & Underwood - Public Domain
Original uploader was Sadi Carnot - Public Domain
Harris & Ewing - Public Domain
Unknown, but probably a professional photographer.<br/> - Public Domain
Radcliffe Kelso - CC BY-SA 4.0
Greens WA -
Bbkkk -
HABS, attributed to Gilbert Stuart - Public Domain
Elisa.rolle - CC BY-SA 4.0
Unidentified photographer - Public Domain
Walter J. Bigelow - Public Domain
Cultura Banco de la República - CC BY 2.0
No photographer's name is given. - Public Domain
Public Domain
Yustas - CC BY-SA 3.0
Adolf Neumann - Public Domain
Image from Wikimedia Commons
unknown - Public Domain
Hall, Basil, 1788-1844
Image from Wikimedia Commons
Kinney, William B. (William Burnet), 1799-1880
Image from Wikimedia Commons
Erling Mandelmann - CC BY-SA 3.0
Tobey, Mark
Image from Wikimedia Commons
Underwood & Underwood - Public Domain
Muir, John, 1838-1914
Image from Wikimedia Commons
Durán, Agustín
Image from Wikimedia Commons
Wallon, Henri, 1879-1962
Image from Wikimedia Commons
Original uploader was Sadi Carnot - Public Domain
Clausius, R. (Rudolf), 1822-1888
Image from Wikimedia Commons
Harris & Ewing - Public Domain
Fuller, Alvan T. (Alvan Tufts), 1878-1958
Image from Wikimedia Commons
Unknown, but probably a professional photographer.<br/> - Public Domain
Hewes, David, 1822-1915
Image from Wikimedia Commons
Radcliffe Kelso - CC BY-SA 4.0
McCutcheon, John, 1952-
Image from Wikimedia Commons
Mallot, Byron, 1943-
Image from Wikimedia Commons
Roscoe, Henry E. (Henry Enfield), 1833-1915
Image from Wikimedia Commons
Joseph, George W., 1872-1930
Image from Wikimedia Commons
Greens WA -
Margetts, Dee, 1955-
Image from Wikimedia Commons
Learning, Walter, 1938-
Image from Wikimedia Commons
Bbkkk -
Sánchez-Albornoz, Claudio, 1893-1984
Image from Wikimedia Commons
Turgot, Anne-Robert-Jacques, baron de l'Aulne, 1727-1781
Image from Wikimedia Commons
HABS, attributed to Gilbert Stuart - Public Domain
Burd, James, 1726-1793
Image from Wikimedia Commons
Elisa.rolle - CC BY-SA 4.0
James, Charles, -1978
Image from Wikimedia Commons
Galilei, Galileo, 1564-1642
Image from Wikimedia Commons
Unidentified photographer - Public Domain
Cortissoz, Royal, 1869-1948
Image from Wikimedia Commons
Dyer, Elisha, 1811-1890
Image from Wikimedia Commons
BAST, ORNULF.
Image from Wikimedia Commons
Walter J. Bigelow - Public Domain
Plumley, Charles Albert, 1875-1964
Image from Wikimedia Commons
Cultura Banco de la República - CC BY 2.0
Santos, Eduardo, 1888-1974
Image from Wikimedia Commons
No photographer's name is given. - Public Domain
Davies, Clara Novello, 1861-1943
Image from Wikimedia Commons
Public Domain
Lane, Lafayette, 1842-1896
Image from Wikimedia Commons
Sigonio, Carlo, 1524?-1584
Image from Wikimedia Commons
Yustas - CC BY-SA 3.0
Zeffirelli, Franco
Image from Wikimedia Commons
Adolf Neumann - Public Domain
Prutz, Robert Eduard, 1816-1872