# William Mark Clark

> 19th century publisher

**Wikidata**: [Q109501939](https://www.wikidata.org/wiki/Q109501939)  
**Source**: https://4ort.xyz/entity/william-mark-clark


## References

1. British Book Trade Index
2. Price One Penny
3. [Sylvester Sound the Somnambulist](https://commons.wikimedia.org/w/index.php?title=File:Sylvester_Sound,_the_somnambulist_(IA_sylvestersoundso00cockrich).pdf&page=7)