| 513120 |
Trade magazine and periodical publishers, exclusively on Internet |
| 513130 |
Publishers (except exclusive Internet publishing), book |
| 513130 |
Almanac publishers |
| 513130 |
Almanac publishers (except exclusive Internet publishing) |
| 513130 |
Almanac publishers and printing combined |
| 513130 |
Almanac publishers, exclusively on Internet |
| 513130 |
Atlas publishers |
| 513130 |
Atlas publishers (except exclusive Internet publishing) |
| 513130 |
Atlas publishers and printing combined |
| 513130 |
Atlas publishers, exclusively on Internet |