# Category:Blytt–Sernander system

> Wikimedia category

**Wikidata**: [Q8303448](https://www.wikidata.org/wiki/Q8303448)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Category:Blytt–Sernander_system)  
**Source**: https://4ort.xyz/entity/category-blytt-sernander-system