Columbia subject headings:
Abolitionists--Congresses.
Anstey, Roger.
Slaves--Emancipation--Congresses.
Harvard subject headings:
Abolitionists--Congresses.
Anstey, Roger.
Slaves--Emancipation--Congresses.
Princeton subject headings:
Abolitionists--Congresses.
Anstey, Roger.
Slaves--Emancipation--Congresses.