DescriptionNikolayIvanovichLobachevskycrop.jpg Pic of a 19th century painting. Public domain, from en wiki image Date 19th century date QS:P,+1850-00-00T00:00:00Z/7
DescriptionLobachevsky 03 crop.jpg English: NikolayIvanovichLobachevsky Русский: Николай Иванович Лобачевский Date 1839 Source http://cczy.blog.ru/?year=2009&month=11