Petroleum and Coal Products


29 Petroleum and Coal Products
291 Petroleum Refining
2911 Petroleum refining
295 Asphalt Paving and Roofing Materials
2951 Asphalt paving mixtures and blocks
2952 Asphalt felts and coatings
299 Misc. Petroleum and Coal Products
2992 Lubricating oils and greases
2999 Petroleum and coal products, nec