# Before Present

> calendar era

**Wikidata**: [Q503142](https://www.wikidata.org/wiki/Q503142)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Before_Present)  
**Source**: https://4ort.xyz/entity/before-present


## References

1. Freebase Data Dumps. 2013
2. [OpenAlex](https://docs.openalex.org/download-snapshot/snapshot-data-format)