I am searching in NARA's AAD for passenger list information for several German ancestors. I can find the names and then use the Manifest ID Number to search for more personal information. I understand that to get the ship information I need to use the Manifest ID No. and search the "Manifest Header Records" to get ship information and dates . After reading all the FAQs it is still not clear to me where to find the Manifest Header Records (is that the same as the Manifest Header Data File? -- can't find that either.)