Columbia subject headings:
Historic sites--Law and legislation--United States.
Real property and taxation--United States.
Servitudes--United States.
Tax exemption--United States.
Harvard subject headings:
Historic sites--Law and legislation--United States
Income tax deductions for charitable contributions--United States
Real property and taxation--United States.
Servitudes--United States.
Tax exemption--United States
Tax incentives--Law and legislation--United States.
Princeton subject headings: