Columbia subject headings:
Africa--Description and travel.
America--Description and travel.
Asia--Description and travel.
Europe--Description and travel.
Harvard subject headings:
Africa--Description and travel--Juvenile literature.
America--Description and travel--Juvenile literature.
Asia--Description and travel--Juvenile literature.
Europe--Description and travel--Juvenile literature.
Slavery--Juvenile literature.
Princeton subject headings:
Africa--Description and travel.
America--Description and travel.
Asia--Description and travel.
Europe--Description and travel.