Columbia subject headings:
Booth, John Wilkes, 1838-1865.
Lincoln, Abraham, 1809-1865--Assassination.
Harvard subject headings:
Booth, John Wilkes, 1838-1865
Lincoln, Abraham, 1809-1865--Assassination.
Princeton subject headings:
Booth, John Wilkes, 1838-1865.
Lincoln, Abraham, 1809-1865--Assassination.