13 - Oil & Gas Extraction
1311 - Crude Petroleum & Gas Production
1381 - Drilling Oil & Gas Wells

13 - Mining
1041 - Gold Mining
1221 - Coal Mining
1446 - Sand
1455 - Clay Mining
1474 - Potash Soda Borate
1999 - Mining NEC

20 - Foods
2011 - Meat Packing & Processing Plants
2015 - Poultry Packing & Processing Plants
2041 - Flour Mills
2043 - Cereal Mills
2044 - Rice Mills
2045 - Prepared Flour Mixes & Doughs
2046 - Wet Corn Mill - Starch, etc.
2047 - Pet Foods
2048 - Feed Mills
2051 - Bakery
2052 - Snack Foods & Cookies/Crackers
2062 - Refined Sugar
2064 - Candy
2079 - Oil Mills, Soybean, Cotton, etc.
2083 - Brewery
2086 - Soft Drinks
2096 - Chips - Potato/Corn
2098 - Pasta
2099 - Foods not classified elsewhere

26 - Paper & Allied Products
2431 - Wood Millworks & Other Mfd. Wood Products
2493 - Reconstituted Wood Products
2611 - Pulp Mills
2621 - Paper Mills
2631 - Paperboard Mills
2653 - Corrugated Box Plant
2656 - Sanitary Food Container

28 - Chemicals & Allied Products
2819 - Inorganic Chemicals (Dry)
2821 - Resin Producers
2823 - Fibers
2834 - Pharmaceuticals
2841 - Soaps
2844 - Toothpaste
2851 - Paints
2869 - Organic Chemicals (Liquids)
2873 - Nitrogenous Fertilizers
2874 - Phosphatic Fertilizers
2891 - Adhesives & Sealants
2899 - Chemicals NEC