Friedrich Fröbel
1919 · Good
€20
Charles Riborg Mann
1916 · Very good
€35
John Dewey
1901 · Good
€45
Friedrich Fröbel
1913 · Good
€20
Chancellor, William Estabrook
1908 · Good
€70
Jan Jacob Bruins
1935 · Very good · NL
€45
Thorstein Veblen, Teichgraeber, Richard F., III
1932 · Good
€20
Hugo D. Froehlich, Bonnie E. Snow
1928 · Very good
€25
Augustin Privat-Deschanel
1903 · Very good
€40
John Dewey
1910 · Fine
€30
Gertrude Dudley
1909 · Very good
€85
Maria Montessori
1931 · Good
€110
John Henry Newman
1919 · Good
€70
A. S. Neill
1935 · Very good
€45
Balfour Stewart
1919 · Good
€20
Frederick Orpen Bower, Sydney Howard Vines
1903 · Fair
€45
Otto Jespersen, Otto Jespersen
1904 · Good
€95
Abraham Flexner
1920 · Very good
€30
Florian Cajori
1929 · Good
€65
Wilbur Pardon Bowen
1935 · Good
€50
Steven S. Zumdahl
1907 · Very good
€25
Edward Sapir
1926 · Good
€40
Elie Metchnikoff
1903 · Very good
€35
John Dewey
1920 · Very good
€40
Thomas Henry Huxley
1901 · Good
€35
Rabindranath Tagore
1917 · Very good
€35
Booker T. Washington
1919 · Fine
€105
Arthur A. Noyes
1935 · Good
€20
Ron Larson
1906 · Good
€45
Edward Carpenter
1914 · Very good
€70
Eugène Pittard
1926 · Good
€20
L. A. Borradaile
1935 · Good
€20
Edward Eggleston
1922 · Fair
€70
Eskelhoff Carsjen Gravemeijer
1902 · Good · NL
€30
Benedetto Croce
1912 · Very good
€25
Mary Baker Eddy
1911 · Very good
€70
Seneca Egbert
1908 · Good
€30
Steven S. Zumdahl
1915 · Good
€45
William Beebe
1922 · Very good
€60
Edward Carpenter
1906 · Good
€25
Peter Kropotkin
1925 · Very good
€35
Edward Bernard Koster
1916 · Fine · NL
€90
Eduard Strasburger
1935 · Fine
€45
Carl David Tolmé Runge
1916 · Fine
€50
Cassius Jackson Keyser
1935 · Good
€50
Dudley Allen Sargent
1917 · Very good
€30
Yogananda Paramahansa
1931 · Fine
€125
Matthew Charteris
1916 · Fine
€80
Hilde Hacquebord
1911 · Good · NL
€40
Ethel Home
1934 · Very good
€45
Worthington Hooker
1906 · Very good
€30
Frans Verschoren
1913 · Good · NL
€20
H. Newell Martin
1903 · Fine
€40
John Ruskin
1900 · Very good
€25
Felix Klein
1926 · Very good
€35
George Edward Moore
1922 · Good
€50
Theodoor Jorissen
1902 · Good · NL
€30
R. V. Pierce
1914 · Very good
€35
L. Bautain
1911 · Good
€45
Klikspaan
1935 · Fair · NL
€35