- A works using sealed retorts to produce charcoal. Wood distillates may be produced as byproducts of this process. They may be found at separate works or comprise part of a gunpowder works.
- English Heritage
- http://creativecommons.org/licenses/by/3.0 (FISH Thesaurus of Monument Types)
- http://www.english-heritage.org.uk (FISH Thesaurus of Monument Types)
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