Columbia subject headings:
National parks and reserves--Fees--United States.
Public lands--Fees--United States.
User charges--Law and legislation--United States.
Vacation homes--Law and legislation--United States.
Harvard subject headings:
National parks and reserves--Fees--United States
Public lands--Fees--United States.
User charges--Law and legislation--United States.
Vacation homes--Law and legislation--United States.
Princeton subject headings:
National parks and reserves--Fees--United States.
Public lands--Fees--United States.
User charges--Law and legislation--United States.
Vacation homes--Law and legislation--United States.