Columbia subject headings:
Historic sites--United States--Guidebooks--Juvenile literature.
National parks and reserves--United States--Guidebooks--Juvenile literature.
United States--History, Military--Juvenile literature.
Harvard subject headings:
Historic sites--United States--Guidebooks--Juvenile literature.
National parks and reserves--United States--Guidebooks--Juvenile literature.
United States--History, Military--Juvenile literature.
Princeton subject headings:
Historic sites--United States--Guidebooks--Juvenile literature.
National parks and reserves--United States--Guidebooks--Juvenile literature.
United States--History, Military--Juvenile literature.