Friedrich Engels
1930 · Good
€30
Frederick Orpen Bower
1934 · Good
€50
Wouter Hendrik Van Seters
1935 · Good · NL
€50
Peter Kropotkin
1925 · Very good
€35
Verney Lovett Cameron, Daniel Oliver
1912 · Good
€25
R. C. Boer
1926 · Very good · NL
€50
Annie Salomons
1935 · Good · NL
€20
Annie Salomons
1923 · Very good · NL
€25
Eugen Horn
1900 · Good · NL
€50
A. G. Honig
1921 · Very good · NL
€45
Edward Austin Johnson
1894 · Good
€50
Ernest Thompson Seton
1905 · Good
€35
Stijn Streuvels
1912 · Fair · NL
€15
Algernon Graves
1920 · Good
€40
Michael Idvorsky Pupin
1923 · Fair
€15
Johan de Meester
1919 · Fair · NL
€35
Anthonis Duyck
1872 · Good · NL
€40
Frans Verschoren
1913 · Good · NL
€20
Arnold Bennett
1914 · Good
€50
M. Buys
1935 · Good · NL
€25
Marcellus Emants
1889 · Fair · NL
€40
Marcellus Emants
1900 · Very good · NL
€25
Marcellus Emants
1904 · Good · NL
€20
Salomon Reinach
1935 · Fair
€15
Nederlandse Mycologische Vereniging
1918 · Fair · NL
€15
Jean Marie Antoine Gevers Leuven
1904 · Good · NL
€20
Hélène Swarth
1921 · Good · NL
€30
George J. Engelmann
1927 · Fair
€35
Thomas McIlwraith
1903 · Very good
€45
Arthur van Schendel
1935 · Good · NL
€45
Nicolass Muller
1915 · Fine · NL
€35
Klikspaan
1935 · Fair · NL
€35
Harry Sturgeon Crossen
1924 · Very good
€25
M. Buys
1901 · Good · NL
€45
Eliza Laurillard
1891 · Fair · NL
€45
Jan Casper Schreuder
1930 · Good · NL
€45
Edwin Hatch
1887 · Fair
€35
Justus van Maurik
1914 · Very good · NL
€45
Louis Couperus
1904 · Good · NL
€30
British Ornithologists' Union
1907 · Fair
€45
Adolf Engler
1917 · Good
€25
Martin Robison Delany
1865 · Good
€40
O. E. Rølvaag
1928 · Good
€35
J. van Lennep
1918 · Good · NL
€35
Pieter Cornelis Boutens
1916 · Very good · NL
€35
Laurens Adriaanse
1911 · Good · NL
€25
Martin Andersen Nexø, Steven T. Murray
1909 · Very good
€25
Frederick Orpen Bower, Sydney Howard Vines
1903 · Fair
€45
Ernst Heinrich Philipp August Haeckel
1900 · Fine
€30
Lydia Maria Child
1872 · Fair
€25
Jeremiah Curtin
1907 · Good
€35
D. Wanjon
1927 · Good · NL
€20
Annie Salomons
1916 · Good · NL
€30
Charles de Montalembert
1869 · Very good
€45
Bradley M. Patten
1920 · Good
€30
Charles Fletcher Lummis
1902 · Very good
€25
Lawrence Sklar
1911 · Very good
€30
W. Vrolik
1852 · Fair · NL
€40
Howard A. Kelly
1899 · Very good
€45
Roy Chapman Andrews
1926 · Good
€25