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In page Creosote:

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The information that follows describing the other various types of creosote materials and its uses should be considered as primarily being of only historical value.[citation needed] This history is important, because it traces the origin of these different materials used during the 19th and early 20th centuries. Furthermore, it must be considered that these other types of creosotes – lignite-tar, wood-tar, water-gas-tar, etc. – are not currently being manufactured and have either been replaced with more-economical materials, or replaced by products that are more efficacious or safer.[citation needed]