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BIBLIOGRAPHY

Wikipedia「Soho Mint」「Matthew Boulton」「British penny (1714–1901)」

Wikipedia (according to the sources of each article)

Claims Supported by This Source

  1. Boulton built a mint at his Soho factory in 1788
  2. Over 45 million copper coins were produced in two years from 1797
  3. The first official British coins struck by steam ('British penny (1714–1901)')
  4. In 1786, two-thirds of the coins circulating in Britain were counterfeit ('Matthew Boulton')

How to read the verification levels. 'Read' means the material was read in its entirety. 'Bibliography and abstract confirmed' means the bibliographic information and abstract were verified. 'Via course material' means the source was referenced through the main text of a book or a country's monetary history. The text hash is the SHA-256 of the main text from the original source page, excluding tags and whitespace, used to detect if the material has been altered.