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BIBLIOGRAPHY

American Numismatic Association, Money Museum virtual exhibit（Silk Road case 2）

American Numismatic Association

Claims Supported by This Source

  1. Knife money and spade money originated from actual bronze knives and spades, retaining their shape even after they could no longer be used as tools.
  2. Knife money began in Qi, and spade money with a hollow handle began in the central states from the end of the 7th century BCE. Both were abolished in 221 BCE at the beginning of the Qin dynasty.

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.