| 513120 |
Medical journal and periodical publishers (except exclusive Internet publishing) |
| 513120 |
Medical journal and periodical publishers and printing combined |
| 513120 |
Medical journal and periodical publishers, exclusively on Internet |
| 513120 |
Newsletter publishers |
| 513120 |
Newsletter publishers (except exclusive Internet publishing) |
| 513120 |
Newsletter publishers and printing combined |
| 513120 |
Newsletter publishers, exclusively on Internet |
| 513120 |
Periodical publishers |
| 513120 |
Periodical publishers (except exclusive Internet publishing) |
| 513120 |
Periodical publishers and printing combined |