Jørgen Peter Müller
1902 · Fine
€155
Auguste Comte
1930 · Good
€30
Martin Klopstock
1911 · Good
€35
Friedrich Fröbel
1913 · Good
€20
Adolf Engler
1917 · Good
€25
Lewis Foreman Day
1920 · Fine
€70
Max Scheler
1935 · Good
€20
Peter Willem Hendrik Truyen
1901 · Fair · NL
€15
Roger Eliot Fry
1931 · Very good
€30
Garrett Putman Serviss
1935 · Good
€95
Yogananda Paramahansa
1931 · Fine
€125
Upton Sinclair
1927 · Very good
€75
G. Wisse
1908 · Very good · NL
€30
Plato
1917 · Good
€30
J. Reynolds Green
1916 · Fair
€20
F. Pijper
1923 · Very good · NL
€75
Lafcadio Hearn
1935 · Good
€20
R. Fletcher
1922 · Good
€20
Thorstein Veblen, Teichgraeber, Richard F., III
1932 · Good
€20
Abraham Kuyper
1935 · Very good · NL
€50
W. Simon
1912 · Good
€70
William Kingdon Clifford
1914 · Fair
€35
Anton Willem Nieuwenhuis
1909 · Very good · NL
€75
Jan van Leeuwen
1924 · Very good · NL
€30
Jacob van Lennep, Johannes Bosscha
1926 · Very good · NL
€90
Frank Hall Thorp
1906 · Good
€25
Woodrow Wilson
1922 · Fine
€45
Freda Dinn
1903 · Very good
€35
J. van Lennep
1911 · Very good · NL
€45
Jan Casper Schreuder
1930 · Good · NL
€45
René Descartes
1912 · Very good
€85
Herman Gorter
1935 · Very good · NL
€40
Hilaire Belloc
1908 · Good
€70
Foeke Buitenrust Hettema
1914 · Very good · NL
€55
Michiel Cornelis van Mourik Broekman
1925 · Very good · NL
€95
Walter E. Thirring
1906 · Fine
€40
Eugène Pittard
1926 · Good
€20
Phillips Brooks
1915 · Good
€65
Carl Gustav Jung
1915 · Very good
€25
Percival Lowell
1907 · Very good
€25
John Dewey
1901 · Good
€45
Miguel de Unamuno
1935 · Good
€25
Osler, William Sir
1926 · Very good
€45
Samuel Gronemann
1935 · Good · NL
€110
Louis Couperus
1906 · Very good · NL
€50
John Cowper Powys
1933 · Very good
€50
J. H. W. Leliman
1920 · Good · NL
€45
Herbert B. Mason
1910 · Very good
€35
Bronger van Halteren
1911 · Good · NL
€65
E. V. Lucas
1924 · Good
€20
A. S. Neill
1935 · Very good
€45
F. W. van Wijk
1935 · Good · NL
€30
Louis Couperus
1904 · Very good · NL
€25
José Ortega y Gasset
1935 · Good
€45
Ware, William R.
1935 · Fair
€15
Rabindranath Tagore
1935 · Good
€30
Ralph W. G. Wyckoff
1935 · Very good
€30
Silvanus Phillips Thompson
1935 · Very good
€35
J. A. Dubois
1902 · Very good
€25
Sigmund Freud
1906 · Good
€25