John James Audubon
1889 · Fair
€30
C. J. Maynard
1885 · Good
€35
W. H. Hudson
1901 · Good
€25
Henry Walter Bates
1885 · Fair
€30
W. H. Hudson
1935 · Very good
€25
Robert W. C. Shelford, Edward Bagnall Poulton
1919 · Very good
€40
Ward, James
1902 · Good
€20
Arabella B. Buckley
1887 · Good
€45
Gilbert White, Anne Secord
1926 · Good
€20
Edward Jesse
1862 · Good
€40
John Charles Van Dyke
1905 · Very good
€35
John George Wood
1870 · Fair
€40
Worthington Hooker
1906 · Very good
€30
Philip Henry Gosse
1868 · Fair
€40
Bernard Boedder
1897 · Fair
€40
F. Max Müller
1914 · Very good
€25
Galen, Arthur John Brock
1924 · Very good
€40
Edgar Allan Poe, John Montgomery Gambrill
1925 · Very good
€50
Jean Louis Rodolphe Agassiz
1884 · Fair
€50
Edwin Checkley
1890 · Good
€50
Augustin Privat-Deschanel
1903 · Very good
€40
John Francis Campbell
1865 · Good
€50
Dionysius Lardner
1875 · Very good
€50
George Berkeley
1915 · Very good
€50
A. Ackerman
1852 · Fair
€35
John Reid Muir
1899 · Good
€40
John Reid Muir
1911 · Very good
€40
John Reid Muir
1935 · Good
€40
Charles Fletcher Lummis
1902 · Very good
€25
Carla Yanni
1901 · Fair
€35
W. Hamilton Gibson
1910 · Good
€20
Mary Austin
1926 · Good
€35
Henry David Thoreau
1908 · Very good
€50
Franz Wilhelm Junghuhn, Frans Junghuhn
1851 · Fair · NL
€40
Henry David Thoreau
1863 · Good
€35
I. F. Henderson
1926 · Very good
€40
Richard Jefferies
1918 · Fair
€15
G. N. Watson
1935 · Good
€20
Percival Lowell
1907 · Very good
€25
Charles Kingsley
1881 · Fair
€45
John Muir
1935 · Very good
€25
Grant Allen
1906 · Fair
€15
Edward Thomas
1914 · Good
€30
Alfred Russel Wallace
1864 · Fair
€35
John Leslie
1861 · Fair
€50
Grant Allen
1884 · Very good
€45
Henry Drummond
1891 · Fair
€40
Dallas Lore Sharp
1911 · Fair
€30
Alfred Russel Wallace
1884 · Good
€40
W. H. Hudson
1935 · Good
€30
W. H. Hudson
1905 · Good
€20
G. Hartwig
1900 · Good
€25
John Burroughs
1887 · Very good
€50
Catherine Parr Traill
1917 · Very good
€25
Alexander von Humboldt
1853 · Very good
€50
Frederick Courteney Selous
1885 · Good
€50
Susan Fenimore Cooper
1851 · Good
€40
Catherine Parr Traill, Elizabeth Thompson
1908 · Fair
€20
Catherine Parr Traill
1890 · Fair
€30
E. J. Banfield
1923 · Good
€35