USCIS Instructions for Form G-639, FOIA Request

Form G-639, FOIA Request

Annotated Form G-639 FOIA Request

Reading a Green Card Tutorial

List of Nonimmigrant and Immigrant Codes

Continuum of Immigration Statuses

ILRC DHS FOIA Practice Advisory (2019)

USCIS FOIA Request Guide (USCIS 2019)