BIBLIOGRAPHY
Wikipedia, "Maria Theresa thaler" and German edition "Maria-Theresien-Taler".
Wikipedia (according to the sources of each article)

Claims Supported by This Source
- In the Red Sea region, merchants would accept no other currency.
- Kalmer and Hyun estimate that of the 245 million coins minted by 1931, over 20% went to Ethiopia.
- Approximately 389 million coins were minted from 1751–2000; in the 19th century, it was the sole means of payment in southern and western Arabia (German edition).
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.