Columbia subject headings:
Harvard subject headings:
Children and war--Germany--History--20th century--Congresses.
Children of single parents--History--20th century--Congresses.
Children of single parents--Social aspects--Congresses.
Fatherhood--History--20th century--Congresses.
Fatherhood--Social aspects--Congresses.
Fatherless families--Germany--History--20th century--Congresses.
Fatherless families--History--20th century--Congresses.
Fatherless families--Social aspects--Congresses.
Princeton subject headings:
Children and war--Germany--History--20th century--Congresses.
Children of single parents--History--20th century--Congresses.
Children of single parents--Social aspects--Congresses.
Fatherhood--History--20th century--Congresses.
Fatherhood--Social aspects--Congresses.
Fatherless families--Germany--History--20th century--Congresses.
Fatherless families--History--20th century--Congresses.
Fatherless families--Social aspects--Congresses.