Columbia subject headings:
Forests and forestry--Canada.
Forests and forestry--United States.
Lumber trade--Canada.
Lumber trade--United States.
Harvard subject headings:
Forests and forestry--Canada
Forests and forestry--United States
Timber--Canada.
Timber--United States
Princeton subject headings:
Forests and forestry--Canada.
Forests and forestry--United States.
Lumber trade--Canada.
Lumber trade--United States.