Biographisches Lexikon des Kaiserthums Oesterreich
Biographisches Lexikon des Kaiserthums Oesterreich (English, Biographical Encyclopedia of the Austrian Empire) (abbreviated Wurzbach from the author's surname) is a 60-volume work, edited and published by Constantin von Wurzbach,  containing about 24,254 critical biographies of notable personages in every walk of life and from all parts of the Austro-Hungarian monarchy who were born, lived or worked there during the period 1750–1850.