Columbia subject headings:
Agricultural industries--United States--Employees.
Foreign workers--United States.
Migrant agricultural laborers--United States.
Seasonal labor--United States.
Harvard subject headings:
Agricultural laborers--Health and hygiene--United States.
Agricultural laborers--Salaries, etc.--United States.
Agriculture and state--United States.
Foreign workers--United States
Princeton subject headings:
Agricultural laborers--Health and hygiene--United States.
Agricultural laborers--Salaries, etc.--United States.
Agriculture and state--United States.
Foreign workers--United States.