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BIBLIOGRAPHY

Wikipedia「Electrum」「Hoard」「History of coins」

Wikipedia (according to the sources of each article)

Claims Supported by This Source

  1. The first coins were made of electrum, a natural alloy of gold and silver. Late 7th or early 6th century BC.
  2. Lydian coins contained 45-55% gold.
  3. A hoard is a collection of coins buried in the ground with the intention of later recovery, but which was not recovered ("Hoard").

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.