This industry comprises establishments primarily engaged in manufacturing Portland, natural, masonry, pozzolanic, and other hydraulic cements. Cement manufacturing establishments may calcine earths or mine, quarry, manufacture, or purchase lime. Establishments primarily engaged in--

Including:

• Cement (e.g., hydraulic, masonry, Portland, pozzolana) manufacturing
• Cement clinker manufacturing
• Natural (i.e., calcined earth) cement manufacturing