# limestone

> sedimentary rocks made of the chemical substance calcium carbonate

**Wikidata**: [Q23757](https://www.wikidata.org/wiki/Q23757)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Limestone)  
**Source**: https://4ort.xyz/entity/limestone


## References

1. [Source](https://www.geoberuf.de/index.php/derbdg-2/gestein-des-jahres.html?start=8)
2. Limestone. ECHA Substance Infocard database
3. [Nuovo soggettario](https://thes.bncf.firenze.sbn.it/termine.php?id=21046)
4. Nuovo soggettario
5. Freebase Data Dumps. 2013
6. [Source](https://www.steine-und-minerale.de/atlas.php?f=3&l=K&name=Kalkstein)
7. BBC Things
8. YSO-Wikidata mapping project
9. BabelNet
10. [Environment Ontology](https://raw.githubusercontent.com/INCATools/environments2wikidata/master/matches/curated-high-confidence-envo.tsv)
11. [archINFORM](https://www.archinform.net/service/wd_aistich.php)
12. National Library of Israel
13. KBpedia
14. GF WordNet