I know this is an old posting, but perhaps you are still active. My interest is the Kurkowski family -- Frank and his wife Anna (Barakowska (I think)) who came to Berlin in 1868 and his children. I'm particularly interested in Peter, b. 1877 who disappears from the records before 1905, Mary b. 1878 who also disappears, and twin sisters, Josie and Frances, who both stayed in Berlin through the 1940s. Also I'm trying to tie Frank with other Kurkowskis who came to Berlin a bit later , Joseph in 1880 and then moved to Stockton.
I had hoped to do this research myself while visiting my son in Madison, but he just moved to Seattle, so this trip will likely never happen.