Columbia subject headings:
Harvard subject headings:
Forest conservation--United States--History--Dictionaries.
Forest conservation--United States--History--Encyclopedias.
Forests and forestry--United States--History--Dictionaries.
Forests and forestry--United States--History--Encyclopedias.
Princeton subject headings:
Forest conservation--United States--History--Dictionaries.
Forests and forestry--United States--History--Dictionaries.