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| 4510 | Anthracite mine tunneling, on a contrast basis | |
| 1010 | Anthracite mining | |
| 4510 | Anthracite mining services on a contract basis | |
| 2411 | Anthraquinone dyes, manufacturing | |
| 2927 | Antiaircraft artillery, manufacturing | |
| 2423 | Antibacterial finishing, textile products | |
| 2423 | Antibacterial preparations, manufacturing | |
| 5139 | Antibiotic medicines, wholesale | |
| 2423 | Antibiotic preparations, manufacturing | |
| 2423 | Antibiotics (including veterinary), manufacturing | |
| 2423 | Antibiotics, uncompounded, manufacturing | |
| 2423 | Anticholinergics, uncompounded, manufacturing | |
| 2423 | Anticonvulsants, uncompounded, manufacturing | |
| 2423 | Antidepressant preparations, manufacturing | |
| 2423 | Antidepressants, uncompounded, manufacturing | |
| 2429 | Antifreeze preparations, manufacturing | |
| 2429 | Anti-freeze recycling | |
| 5149 | Anti-freeze, automotive, wholesale | |
| 2423 | Antifungus finishing, textile products | |
| 2423 | Antigens, manufacturing | |
| 2423 | Antihistamine preparations, manufacturing | |
| 5149 | Anti-knock preparations, automotive, wholesale | |
| 2411 | Antimony based pigments, manufacturing | |
| 1320 | Antimony concentrates, mining | |
| 1320 | Antimony mine | |
| 1320 | Antimony ore mining | |
| 2411 | Antimony oxides (except pigments), manufacturing | |
| 2720 | Antimony smelting and primary refining | |
| 2423 | Antineoplastic preparations, manufacturing | |
| 2424 | Anti-perspirants, personal, manufacturing | |
| 9199 | Antipoverty advocacy organizations | |
| 2423 | Antipyretic preparations, manufacturing | |
| 5020 | Antique and classic automobile restoration | |
| 5010 | Antique autos, retail | |
| 5020 | Antique car restoration | |
| 5260 | Antique furniture refinishing | |
| 5260 | Antique furniture repair and restoration | |
| 5260 | Antique furniture, repair | |
| 5240 | Antique furniture, retail | |
| 5240 | Antique home furnishings, retail | |
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