Key:period
This key seems to be in use, but not documented currently.
As of 2020-04, this key is used on 1 540 objects.
Top 5 values:
- 25% - "1943 - 1945"
- 6% - "1960"
- 6% - "WWII"
- 5% - "1939 - 1951"
- 5% - "1940"
Other relevant values include "bronze_age", "early_iron_age" and "aurelian".
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