Danish Mathematical Society was created in 1873.
Danish Astronautical Society was created in 1949.
Danish Society for Nature Conservation was created in 1911.
Royal Danish Horticultural Society's Garden was created in 1882.
Polish Mathematical Society was created in 1917.
Luxembourg Mathematical Society was created in 1989.
Kharkov Mathematical Society was created in 1879.
Swiss Mathematical Society was created in 1910.
Portuguese Mathematical Society was created in 1940.
Hellenic Mathematical Society was created in 1918.
German Mathematical Society was created in 1890.
Calcutta Mathematical Society was created in 1908.
American Mathematical Society was created in 1888.