| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | back [prep] the 1930s | 13 |
|
| 2 | back in the 1930s | 7 |
|
| 3 | back in the 1930s | 7 |
|
| 4 | back to the 1930s | 6 |
|
| 5 | back to the 1930s | 6 |
|
