Can anyone tell me the significance of notations with dates on the line on  a Passenger Manifest?  For instance, my great-grandmother Maryanna Fortuna (ancestry transcribed as "Aary Forsona) on the SS President Lincoln arriving in NY 6 Mar 1910.  On her line, is notated "3-209785- 1/6/41".    I know that when people apply for citizenship, their passenger list is checked to verify their arrival inforamtion.  This makes me think this notation refers to the date and case number, perhaps, of an application for citizenship.  If this is the case, it is somewhat confusing since I know for a fact that her husband never applied for citizenship and I didn't think women could apply in their own right at that time.   Thanks for any insight!