Columbia subject headings:
Migrant agricultural laborers--Certification--United States.
Migrant agricultural laborers--Legal status, laws, etc.--United States.
Seasonal labor--United States.
United States. Migrant and Seasonal Agricultural Worker Protection Act.
Harvard subject headings:
Migrant agricultural laborers--Certification--United States.
Migrant agricultural laborers--Legal status, laws, etc.--United States.
Seasonal labor--United States.
United States. Migrant and Seasonal Agricultural Worker Protection Act.
Princeton subject headings: