Hi Lauren,
it is your greatgrandfather Passenger Record and Manifest;
http://www.ellisisland.org/search/passRecord.asp?pID=1009430...Michal was going to brother Stanislaw and his father Jozef was in Tereszpol.
If you seriously think about search in Poland, please contact by e-mail my friend Tadeusz in Poland;
searchcoordinator@rootspoland.comCordially,
Wladyslaw