Hello Pyfisch, thanks a lot for your proposal Wikidata:Bot_requests/Archive/2019/7#BLKÖ from December 2018. Do you still plan to realize your proposal?
Topic on User talk:Pyfisch
Sorry, I did not get around to finish it. While I extracted a lot of useful data there were always articles that did not work properly. I think this has been finished now?
Hello Pyfisch, the project page is Help:Import BLKÖ from wikisource (Wikidata:Bot_requests/Archive/2018/11#BLKÖ_(one_time_data_import))