G. Hartwig
1900 · Good
€25
E. J. Banfield
1922 · Very good
€30
E. J. Banfield
1923 · Good
€35
Henry Drummond
1891 · Fair
€40
Wilmore, Albert.
1921 · Good
€35
Rubert W. Boyce
1920 · Very good
€25
Howell, Thomas
1909 · Very good
€30
J. Forsyth
1872 · Good
€35
J. Haak
1928 · Very good · NL
€30
Gerlof van Vloten
1901 · Fair · NL
€15
Victor Ernest Shelford
1935 · Fair
€20
Koninklijk Nederlands Meteorologisch Instituut.
1926 · Good · NL
€30
Eduard Strasburger
1924 · Fine
€40
John Burroughs
1894 · Good
€45
Archibald Thorburn
1935 · Very good
€35
Lewis Mumford
1935 · Very good
€25
Frank Hall Thorp
1906 · Good
€25
André Gide
1931 · Very good
€25
Thomas Henry Huxley
1904 · Good
€35
John Leslie
1861 · Fair
€50
Garrett Putman Serviss
1913 · Good
€35
Marcellus Emants
1900 · Very good · NL
€25
Marcellus Emants
1904 · Good · NL
€20
Almeida Garrett
1857 · Fair
€40
Eduard Strasburger
1935 · Fine
€45
C. A. Johns
1870 · Good
€40
Stijn Streuvels
1912 · Fair · NL
€15
John Charles Van Dyke
1905 · Very good
€35
J. P. Kleiweg de Zwaan
1911 · Fair · NL
€30
T. Takakura, Tadashi Takakura
1901 · Fair
€40
Christopher Morley
1935 · Good
€30
Anthony Trollope
1869 · Fair
€30
Hilaire Belloc
1935 · Good
€45
George Alexander Wilken
1914 · Very good · NL
€40
Frederick Orpen Bower, Sydney Howard Vines
1903 · Fair
€45
Richard A. Proctor
1918 · Good
€50
Mabel Osgood Wright
1903 · Good
€40
Ernest Thompson Seton
1905 · Good
€35
Augustin Privat-Deschanel
1903 · Very good
€40
Alexander von Humboldt
1853 · Very good
€50
Salomon Müller
1870 · Fair · NL
€50
Theun de Vries
1935 · Good · NL
€20
Dr. Seuss
1929 · Very good
€50
Christiaan Lodewijk Houthuysen
1930 · Good · NL
€30
Sir Robert Stawell Ball
1920 · Fair
€15
Frederick A. Ober
1883 · Fair
€30
Franz Wilhelm Junghuhn, Frans Junghuhn
1851 · Fair · NL
€40
Frederick Courteney Selous
1885 · Good
€50
Charles Fort
1933 · Fair
€35
Ernst Bloch
1920 · Very good
€30
Garrett Putman Serviss
1911 · Fair
€50
Martin Robison Delany
1865 · Good
€40
Charles G. D. Roberts
1906 · Good
€30
Robert Louis Stevenson
1906 · Fair
€20
Percival Lowell
1907 · Very good
€25
Orville J. Nave
1905 · Fair
€35
Charles Darwin
1894 · Good
€45
Miller, William J.
1935 · Fair
€20
Samuel Colman, Samuel Colman
1935 · Good
€30
Albert Schweitzer
1926 · Very good
€30