| 513130 |
Religious book publishers, exclusively on Internet |
| 513130 |
School book publishers |
| 513130 |
School book publishers (except exclusive Internet publishing) |
| 513130 |
School book publishers and printing combined |
| 513130 |
School book publishers, exclusively on Internet |
| 513130 |
School textbook publishers |
| 513130 |
School textbook publishers (except exclusive Internet publishing) |
| 513130 |
School textbook publishers and printing combined |
| 513130 |
School textbook publishers, exclusively on Internet |
| 513130 |
Street map guide publishers |