Columbia subject headings:
Graduate students in science--United States.
Student and Exchange Visitor Information System (U.S.)
Students, Foreign--United States.
Terrorism--United States--Prevention.
Visas--United States.
Harvard subject headings:
Graduate students in science--United States.
Student and Exchange Visitor Information System (U.S.)
Students, Foreign--United States
Terrorism--United States--Prevention
Visas--United States.
Princeton subject headings:
Graduate students in science--United States.
Student and Exchange Visitor Information System (U.S.)
Students, Foreign--United States.
Terrorism--United States--Prevention.
Visas--United States.