# perpetual calendar

> calendar valid for many years

**Wikidata**: [Q1383171](https://www.wikidata.org/wiki/Q1383171)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Perpetual_calendar)  
**Source**: https://4ort.xyz/entity/perpetual-calendar


## References

1. Museum of Modern Art online collection
2. Nuovo soggettario
3. Freebase Data Dumps. 2013
4. Integrated Authority File
5. BabelNet
6. National Library of Israel Names and Subjects Authority File