Ancestry.com - Mid-nineteenth-Century Immigrants: "some general ways to determine where your mid-nineteenth-century immigrant was originally from and when he immigrated. These suggestions are meant to get the researcher started on their journey.

Not every immigrant can be located, and some are easier to locate than others. As someone whose children have over twenty separate nineteenth-century immigrants from seven European countries, I can say that it can be done, but it is not always a simple task. "

a useful article from Ancestry Daily News Archive