Julius Döring, Tafel I, Karte des lettischen Sprachgebiets ca1860, Julius Döring

Map of the latvian language area around 1860 according to bielenstein with dialect boundaries and neighboring languages. Source: julius döring: "on the origin of the courland latvians". (with 2 plates) in "proceedings of the courland society for literature and art and publications of the courland provincial museum from the year 1880". Published by steffenhagen and son, mitau 1881. Pp. 47 - 118.