1847 introductions

branch of algebra abstracting logical operations

currency of Liberia

Żubroń (; ) is a hybrid of a domestic cattle and a wisent. The wisent ( in Polish) is the European bison; hence, the żubroń is analogous to the American cattalo. The name żubroń was officially chosen from hundreds of proposals sent to the Polish weekly magazine Przekrój during a contest organised in 1969.

currency of Hawaii between 1847 and 1898

first stamps of the British Colony Mauritius (1847)

self-propelled railcar that contains a steam engine