| Original Language | English |
| First published | 1936 |
| Links | https://en.wikipedia.org/wiki/The_Dark_Frontier |
Editions 3
Add Edition| Title | Publisher | Format | Language | Location | Dates | Impression | |
|---|---|---|---|---|---|---|---|
 | Der dunkle Grenzbezirk | Paperback | German | Switzerland | 1936 | ||
 | Der dunkle Grenzbezirk | Paperback | German | Switzerland | 1936 | ||
 | Der dunkle Grenzbezirk | Paperback | German | Zürich | 1979 | 100/79/9/2 |
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