Columbia subject headings:
Customs administration--Law and legislation--United States.
Emigration and immigration law--United States.
Hmong (Asian people)--Legal status, laws, etc.--United States.
International travel regulations--United States.
Naturalization--United States.
Vietnam War, 1961-1975--Veterans--Legal status, laws, etc.--United States.
Harvard subject headings:
Customs administration--Law and legislation--United States.
Emigration and immigration law--United States.
Hmong (Asian people)--Legal status, laws, etc.--United States.
International travel regulations--United States.
Naturalization--United States
Vietnam War, 1961-1975--Veterans--Legal status, laws, etc.--United States
Princeton subject headings:
Customs administration--Law and legislation--United States.
Emigration and immigration law--United States.
Hmong (Asian people)--Legal status, laws, etc.--United States.
International travel regulations--United States.
Naturalization--United States.
Vietnam War, 1961-1975--Veterans--Legal status, laws, etc.--United States.