Columbia subject headings:
Conservation of natural resources.
Raw materials.
Recycling (Waste, etc.)
Sustainable development.
Harvard subject headings:
Conservation of natural resources.
Raw materials--United States.
Raw materials.
Recycling (Waste, etc.)
Recycling industry--United States.
Sustainable development
Sustainable development--United States
Princeton subject headings:
Conservation of natural resources.
Raw materials.
Recycling (Waste, etc.)
Sustainable development.