| skos:altLabel | - coal
- gas
- bad air
- Gas
- manufactured
- Gasworks
- Coal gasification
- coal gas
- gas works
- gasworks
- illuminating gas
- lighting gas
- town gas
- synthetic natural gas
- (coal) gas
- Illuminating Gas (coal gas)
- Manufactured gas
- Town gas
- blue water gas
- changed over to natural gas
- city gas
- coal (city) gas
- coal and gas works
- coal, or town, gas
- coal-gas
- gas producers
- gas retort
- lighting gas from coal
- manufactured gas
- smell of gas
- towngas
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