Adriaan Pit
1930 · Good · NL
€25
Rudolf Otto
1929 · Fine
€35
Friedrich Fröbel
1913 · Good
€20
Max Scheler
1935 · Good
€20
Rabindranath Tagore
1935 · Good
€30
William De Witt Hyde
1935 · Very good
€25
John Cowper Powys
1933 · Very good
€50
Auguste Comte
1867 · Fair
€50
A. S. Neill
1935 · Very good
€45
Friedrich Schiller
1935 · Fair
€20
Three Initiates
1928 · Good
€20
Herbert Spencer
1867 · Good
€45
William Kingdon Clifford
1914 · Fair
€35
William James
1931 · Good
€40
Inge, William Ralph
1926 · Fine
€50
Morris Raphael Cohen
1935 · Fine
€35
Søren Kierkegaard
1863 · Fair
€45
F. Pijper
1915 · Very good · NL
€40
Plato
1917 · Good
€30
Georg Wilhelm Friedrich Hegel
1910 · Very good
€35
Abraham Kuyper
1897 · Fair · NL
€30
Auguste Comte
1930 · Good
€30
Thorstein Veblen, Teichgraeber, Richard F., III
1932 · Good
€20
Carl Gobée
1861 · Very good · NL
€45
Georg Simmel
1902 · Very good
€40
Thomas Troward
1922 · Good
€30
Walter E. Thirring
1906 · Fine
€40
Robert Flint
1932 · Very good
€40
G. Wisse
1908 · Very good · NL
€30
R. Fletcher
1922 · Good
€20
Gerrit van de Linde
1909 · Fair · NL
€20
J. H. Van Zanten
1928 · Good · NL
€35
Carl Gustav Jung
1915 · Very good
€25
A. van Veldhuizen
1935 · Good · NL
€30
Peter Willem Hendrik Truyen
1901 · Fair · NL
€15
John Dewey
1901 · Good
€45
Ernst Christian Achelis
1902 · Good · NL
€20
Bernard Boedder
1897 · Fair
€40
F. W. van Wijk
1935 · Good · NL
€30
Louis Couperus
1904 · Very good · NL
€25
Sigmund Freud
1906 · Good
€25
José Ortega y Gasset
1915 · Very good
€45
Friedrich Hölderlin
1935 · Fair
€20
Rudolf Otto, Otto, Rudolf (Carl Ludwig Rudolf), 1869-1937.
1929 · Fair
€15
Joseph Le Conte
1928 · Very good
€30
Gerrit Kalff
1928 · Good · NL
€45
Abraham Kuyper
1935 · Very good · NL
€50
Adolf Engler
1917 · Good
€25
Abraham Kuyper
1914 · Good · NL
€20
P. L. Verhulst
1935 · Fair · NL
€15
Eugène Pittard
1926 · Good
€20
Jan van Leeuwen
1924 · Very good · NL
€30
Johan Huizinga
1900 · Good · NL
€35
Albert Einstein, G. B. Jeffery
1926 · Fair
€25
Miguel de Unamuno
1935 · Good
€25
J. van Lennep
1911 · Very good · NL
€45
Heinrich Spoerl
1935 · Fair · NL
€25
Silvanus Phillips Thompson
1935 · Very good
€35
Roger Eliot Fry
1931 · Very good
€30
J. Reynolds Green
1916 · Fair
€20