My great aunt traveled to Europe (I assume to visit ancestors in Germany?) with her husband and daughter in 1930. I have found the return ship's passenger list from Southampton to the port of New York, July 21, 1930, on board the ship, Europa. How do I locate the passenger list from New York to Southampton? I'm hoping to eventually find a passport for her with a photo. Her name was Elizabeth Strack, dob 2/4/1876.