| Source: World War I: Biography and Service Records:
Persons Who Enlisted in St. Louis City and
County Location: Reading room / St. Louis shelves | |
 | |
| Last Name: | Koppen |
| First Name: | Robt. |
| Middle Name: | P. |
| Illustration: | No |
| Address: | 3517a Hartford St. |
| Rank: | Corporal |
| Birth Year: | 1890 |
