Hi James,
when I opened manifest for Jan Gwosdz, I found the
name of city, where all family was born - it is not Lublin,
it is "Luburtno" , in correct spelling LUBARTOW, city on
N from Lublin.
I will try to help you to find conact with possible
cousins in this city, but ...it will take time and I am not
promising to much.
Now search it;
http://www.lubartow.pl/indexen.php

Cordially,
Wladyslaw