Looking for any info on this couple - trying to determine if Julia Gronska is my great grandmother's sister.

Unfortunately there was no return for this marriage license, so I don't know when or where they married, or who married them. I have a ship manifest for my Julia Gronska, a baptism record (Poland) and a record of her purchasing My great grandmothers ticket to the USA.....but nothing else. I can't find either of the people on the marriage license in any other record.....census, city directory, etc.

Help!