I paid for research in Bialystok, Poland. The official archive office there conducted the research. It found two siblings of my great-great-grandmother I never heard of. People from my grandmother's generation also never heard of them either. How can I find more information on Bertha Olga Bleschke, born 1880 in Suprasl, and Herman Ferdinand Bleschke, born in 1878 in Choroszcz. The family was Lutheran. Any help would be greatly appreciated.