| 61119 | Agricultural raw materials n.e.c., wholesale trade services of, except on a fee or contract basis | |
| 61219 | Agricultural raw materials n.e.c., wholesale trade services of, on a fee or contract basis | |
| 91131 | Agricultural research and development, administrative services related to | |
| 81140 | Agricultural science, research and experimental development concerning | |
| 86111 | Agricultural services | |
| 81140 | Agricultural techniques, research and experimental development concerning | |
| 62385 | Agricultural tractors, mail order retail trade services of | |
| 87159 | Agricultural tractors, maintenance and repair of | |
| 62185 | Agricultural tractors, non-specialized store retail trade services of | |
| 62485 | Agricultural tractors, other non-store retail trade services of | |
| 73121 | Agricultural tractors, rental or leasing of, without operator | |
| 62585 | Agricultural tractors, retail trade services of, on a fee or contract basis | |
| 62285 | Agricultural tractors, specialized store retail trade services of | |
| 61185 | Agricultural tractors, wholesale trade services of, except on a fee or contract basis | |
| 61285 | Agricultural tractors, wholesale trade services of, on a fee or contract basis | |
| 91131 | Agricultural veterinary services, administrative services related to | |
| 91131 | Agriculture, administrative services related to | |
| 91131 | Agriculture, support services related to the administration of | |
| 62372 | Agro-chemical products, mail order retail trade services of | |
| 62172 | Agro-chemical products, non-specialized store retail trade services of | |
| 62472 | Agro-chemical products, other non-store retail trade services of | |
| 62572 | Agro-chemical products, retail trade services of, on a fee or contract basis | |
| 62272 | Agro-chemical products, specialized store retail trade services of | |
| 61172 | Agro-chemical products, wholesale trade services of, except on a fee or contract basis | |
| 61272 | Agro-chemical products, wholesale trade services of, on a fee or contract basis | |
| 83115 | Agronomists, consulting services provided by | |
| 67300 | Aid services, navigational | |
| 91220 | Aid to developing countries, economic, administrative services related to | |
| 91220 | Aid to developing countries, non-military, administrative services related to | |
| 91230 | Aid to foreign countries, military, administrative services related to | |
| 73230 | Air conditioners, room, rental or leasing of | |
| 54632 | Air conditioning, installation of | |
| 66120 | Air taxi services by helicopters | |
| 54122 | Air terminals, general construction of | |
| 67190 | Air terminals, handling of baggage at | |
| 67710 | Air terminals, passenger, services of | |
| 67720 | Air traffic approach control | |
| 67720 | Air traffic control services | |
| 67720 | Air traffic landing control | |
| 67720 | Air traffic take-off control | |