Does anyone have any suggestions on how to locate an index for ship's passengers prior to what could be found on the Ellis Island site? I am researching Anton and Mary (ZELINSKI) LASKOWSKI, who immigrated to NYC from "Posen" (listed in the 1920 census as "Pr-Ger" which I presume would mean Prussia-Germany, although this is a Polish family). Anton arr NYC 1887, Mary and child Sophie arrived 1889 according to 1920 census. I am trying to find any other family names that may have traveled with them, either siblings or children.
This is bef Ellis Island site index. I have looked in several Passenger list books to no avail. ISTG site doesn't seem to have an index. Anyone have any other suggestions for me? I am actually trying to locate info on their other children, if any, as well as village (rather than just region) of origin. This family continues to elude me... Jacqi Stevens