Columbia subject headings:
Civil rights--United States.
Constitutional amendments--United States.
United States. Constitution. 13th Amendment.
United States. Constitution. 13th-15th Amendments.
United States. Constitution. 14th Amendment.
United States. Constitution. 15th Amendment.
Harvard subject headings:
Civil rights--United States
Constitutional amendments--United States
Constitutional amendments--United States.
United States. Constitution. 13th Amendment.
United States. Constitution. 13th-15th Amendments.
United States. Constitution. 14th Amendment.
United States. Constitution. 15th Amendment.
Princeton subject headings:
Civil rights--United States.
Constitutional amendments--United States.
United States. Constitution. 13th-15th Amendments