Download the form G-1041, search query genealogical index. You can use form G-1041 to request a search through USCIS historical records. A search request is submitted to determine if there are any records in the USCIS on a particular topic. If you want to get a copy of these records, you need to submit the form G-1041A. The completed form, you can send by mail.
Download the pdf file from the link below.
Read more about Form G-1041 | Genealogy Index Search Request
October 23, 2019