Columbia subject headings:
Harvard subject headings:
Deaconesses--History--19th century--Congresses.
Deaconesses--History--20th century--Congresses.
Medicine--Religious aspects--Christianity--Congresses.
Nursing--History--19th century--Congresses.
Nursing--History--20th century--Congresses.
Princeton subject headings:
Deaconesses--History--19th century.
Deaconesses--History--20th century.
Nursing--History--19th century.
Nursing--History--20th century.