Columbia subject headings:
Harvard subject headings:
Bahai Faith--Congresses.
Baháʼuʼlláh, 1817-1892--Criticism and interpretation.
Mystical union--Congresses.
Princeton subject headings:
Bahai Faith--Congresses.
Baháʼuʼlláh, 1817-1892--Criticism and interpretation--Congre.
Mystical union--Congresses.