Labor on the Douro River
| MPAA Rating: | NR |
| Genre: | Documentary, Short |
| Country: | Portugal |
| Produced By: | Manoel De Oliveira |
| Directed By: | Manoel De Oliveira |
| Written By: | Manoel De Oliveira |
| In Theaters: | Sep 19, 1931 |
| Runtime: | 20 minutes |
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| MPAA Rating: | NR |
| Genre: | Documentary, Short |
| Country: | Portugal |
| Produced By: | Manoel De Oliveira |
| Directed By: | Manoel De Oliveira |
| Written By: | Manoel De Oliveira |
| In Theaters: | Sep 19, 1931 |
| Runtime: | 20 minutes |