Image from Wikimedia Commons
Israeli GPO photographer - Public Domain
El Liberal, Madrid - Public Domain
Th. Mayerhöfer - Public Domain
Lichtig & Englander (agency representing Bradford) - Public Domain
original uploader - Public Domain
Knight Foundation - CC BY-SA 2.0
William Dugdale - Public Domain
Diego Mascarenhas - CC BY-SA 3.0
Dick DeMarsico, World Telegram staff photographer - Public Domain
William Downie - Public Domain
unknown - Public Domain
Lowes Cato Dickinson - Public Domain
Image from Wikimedia Commons
Israeli GPO photographer - Public Domain
Porat, Orna, 1924-
Image from Wikimedia Commons
Negri, Cesare, 1536?-
Image from Wikimedia Commons
El Liberal, Madrid - Public Domain
Granés, Salvador María, 1838-1911
Image from Wikimedia Commons
Granvelle, Antoine Perrenot de 1517-1586
Image from Wikimedia Commons
Th. Mayerhöfer - Public Domain
Haupt, Karl August 1810-1891
Image from Wikimedia Commons
Adams, Alice, 1926-1999
Image from Wikimedia Commons
Holland, Cyril, 1885- 1915
Image from Wikimedia Commons
Joseph, of Cupertino, Saint, 1603-1663
Image from Wikimedia Commons
Chalmers, George, 1742-1825
Image from Wikimedia Commons
Lichtig & Englander (agency representing Bradford) - Public Domain
Bradford, Virginia, 1899-1995
Image from Wikimedia Commons
Heine, Wolfgang, 1861-1944
Image from Wikimedia Commons
original uploader - Public Domain
Plant, Henry Bradley, 1819-1899
Image from Wikimedia Commons
Knight Foundation - CC BY-SA 2.0
Nasar, Sylvia.
Image from Wikimedia Commons
William Dugdale - Public Domain
Hengham, Ralph de -1311
Image from Wikimedia Commons
Adam, Wilhelm, 1877-1949
Image from Wikimedia Commons
Diego Mascarenhas - CC BY-SA 3.0
Ribeiro, Joăo Ubaldo, 1941-
Image from Wikimedia Commons
Schaeffer, Boguslaw
Image from Wikimedia Commons
Dick DeMarsico, World Telegram staff photographer - Public Domain
Feiffer, Jules
Image from Wikimedia Commons
William Downie - Public Domain
Downie, William, 1819-1894
Image from Wikimedia Commons
Johnson, Junior, 1931-
Image from Wikimedia Commons
Brauer, Alfred T. (Alfred Theodore), 1894-1985
Image from Wikimedia Commons
Rich, Giles S.
Image from Wikimedia Commons
unknown - Public Domain
Perls, Frederick S.
Image from Wikimedia Commons
Lowes Cato Dickinson - Public Domain
Auckland, George Eden, Earl of, 1784-1849
Image from Wikimedia Commons
Robineau-Desvoidy, J. B. (Jean-Baptiste), 1799-1857
Image from Wikimedia Commons
Byron, George Gordon Byron, baron, 1788-1824
Image from Wikimedia Commons
Fitch, John, 1743-1798
Image from Wikimedia Commons
Green, Thomas Hill, 1836-1882
Image from Wikimedia Commons
Copernicus, Nicolaus, 1473-1543
Image from Wikimedia Commons
Blizard, William, Sir, 1743-1835