Columbia subject headings:
Agricultural wastes--Information services.
Agricultural wastes--Recycling--Information services.
Fiberboard industry--Information services.
Paper industry--Information services.
Wood-pulp industry--Information services.
Harvard subject headings:
Agricultural wastes--Information services.
Fiberboard industry--Information services.
Paper industry--Information services.
Wood-pulp industry--Information services.
Princeton subject headings:
Agricultural wastes--Recycling--Information services.
Paper industry--Information services.
Wood-pulp industry--Information services.