The Main Archives carried out a scanning of the Bug River records - records and civil records from the years 1590-1911 from eastern Galicia. It contains over 5800 metric books from the eastern pre-war regions of Poland, among others from the province Lviv and Volhynia. More at
http://www.mflegal.pl/lawyer_in_poland_find_your_ancestors_in_poland_bug_river_archive.html