# Ning-tu

> 1:250,000 China topographic series map (L500 NG50-6) produced by the Army Map Service, 04/1959

**Wikidata**: [Q99436233](https://www.wikidata.org/wiki/Q99436233)  
**Source**: https://4ort.xyz/entity/ning-tu


## References

1. [Source](http://id.lib.harvard.edu/alma/990094028280203941/catalog)
2. [Source](http://id.lib.harvard.edu/fgdc/AMS7810_S250_U54_NG50_6/catalog)