Romain Rolland
1918 · Fine
€50
Peter Kropotkin
1910 · Fine
€50
Carl David Tolmé Runge
1916 · Fine
€50
F. Matthias Alexander
1935 · Fine
€35
E. B. Jamieson
1914 · Fine
€40
L. A. Waterbury
1913 · Fine
€45
G. H. Hardy, J. G. Leathem
1916 · Fine
€35
Alfred Russel Wallace
1935 · Fine
€35
Eduard Strasburger
1935 · Fine
€45
Walter E. Thirring
1906 · Fine
€40
H. Newell Martin
1903 · Fine
€40
Erwin Madelung
1935 · Fine
€40
H. Newell Martin, Ernest Gale Martin
1904 · Fine
€40
Hilaire Belloc
1929 · Fine
€35
Thompson, D'Arcy Wentworth
1931 · Fine
€35
Jesse Feiring Williams
1924 · Fine
€35
Nicolass Muller
1915 · Fine · NL
€35
Rudolf Otto
1929 · Fine
€35
Maurice Henry Hewlett
1926 · Fine
€45
Karl Pearson
1934 · Fine
€30
James Martineau
1923 · Fine
€40
Abraham Kuyper
1911 · Fine · NL
€30
Gerard Manley Hopkins
1920 · Fine
€45
Ika A. Thomése
1935 · Fine · NL
€35
Morris Raphael Cohen
1935 · Fine
€35
Charles David Hodgman
1916 · Fine
€45
John Dewey
1910 · Fine
€30
John Willis Clark
1918 · Fine
€50
Antoni Christiaan Winand Staring
1900 · Fine · NL
€30
Frederick Soddy
1935 · Fine
€30
Arthur van Schendel
1921 · Fine · NL
€35
John Reed
1932 · Fine
€40
Antonio Machado
1935 · Fine
€30
Alfred North Whitehead
1930 · Fine
€40
W. L. van Helten
1935 · Fine · NL
€35
Theodore Shennan
1912 · Fine
€45
Eduard Strasburger
1924 · Fine
€40
Wood, Robert Williams
1919 · Fine
€40
Carlton C. Curtis
1907 · Fine
€50
Rembrandt Harmenszoon van Rijn, Holm Bevers
1900 · Fine
€50
Ernst Heinrich Philipp August Haeckel
1900 · Fine
€30
Ivo Struyf
1909 · Fine · NL
€40
Guillaume Groen van Prinsterer
1903 · Fine · NL
€30
Jan van Leeuwen
1935 · Fine · NL
€45
Smithsonian Institution
1935 · Fine
€45
Klaas Johan Pen
1935 · Fine · NL
€35
J. Arthur Thomson
1909 · Fine
€45
Lewis Beesly, Thomas Baillie Johnston
1928 · Fine
€50
Henry Gray F.R.S., Henry Vandyke Carter
1915 · Fine
€50
Jean-Jacques Rousseau
1927 · Fine
€30
Henry Sinclair Hall, Samuel R. Knight
1904 · Fine
€30
Alexis Thomson
1912 · Fine
€30
Gilbert Keith Chesterton, Catholic Way Publishing Staff
1913 · Fine
€35
Steven S. Zumdahl
1915 · Fine
€45
Rudyard Kipling
1919 · Fine
€35
George Bernard Shaw
1927 · Fine
€30
Robert W. Chambers
1925 · Fine
€45
Robert Louis Stevenson
1921 · Fine
€30
Austin M. Patterson
1935 · Fine
€35
William Dean Howells
1924 · Fine
€30