Columbia subject headings:
Environmental policy--United States--Handbooks, manuals, etc.
Real estate business--United States--Handbooks, manuals, etc.
Harvard subject headings:
Environmental policy--United States--Handbooks, manuals, etc.
Real estate business--United States--Handbooks, manuals, etc.
Princeton subject headings:
Environmental policy--United States--Handbooks, manuals, etc.
Real estate business--United States--Handbooks, manuals, etc.