- 14,839 specimens collected from at least 31 countries
- 355 specimens identified from at least 17 countries
- 4,231 specimens used in 69 works
Progress
Collected From
- Netherlands 1,047
- United States 399
- France 223
- Italy 187
- Spain 128
- Switzerland 108
- Germany 101
- Austria 84
- United Kingdom 68
- Algeria 54
- Bosnia and Herzegovina 51
- Belgium 43
- Sweden 38
- Slovenia 20
- Luxembourg 11
- Japan 10
- Canada 9
- South Africa 7
- Brazil 3
- China 3
- Croatia 3
- Romania 2
- Panama 1
- Venezuela 1
- Suriname 1
- Peru 1
- Sint Maarten (Dutch part) 1
- Poland 1
- Grenada 1
- Indonesia 1
- Nepal 1
Identified From
- Netherlands 67
- Japan 36
- Germany 26
- United States 18
- United Kingdom 17
- France 14
- South Africa 13
- Italy 9
- Switzerland 6
- Austria 4
- Belgium 3
- Brazil 3
- Bosnia and Herzegovina 3
- Namibia 2
- Spain 2
- Guyana 1
- Mexico 1
Dates Collected
- 1910 – 1915 1
- 1915 – 1920 7
- 1920 – 1925 149
- 1925 – 1930 963
- 1930 – 1935 679
- 1935 – 1940 584
- 1940 – 1945 190
- 1945 – 1950 1,412
- 1950 – 1955 4,403
- 1955 – 1960 2,846
- 1960 – 1965 2,410
- 1965 – 1970 810
- 1970 – 1975 300
- 1975 – 1980 20
- 1985 – 1990 1
Dates Identified
- 1925 – 1930 4
- 1930 – 1935 46
- 1935 – 1940 11
- 1940 – 1945 2
- 1950 – 1955 111
- 1955 – 1960 67
- 1960 – 1965 2
- 1965 – 1970 1
- 1970 – 1975 1
- 1975 – 1980 2
- 1980 – 1985 1
- 1985 – 1990 1