The Standard Catalog of World Paper Money is a well-known catalogue of banknotes that is published by Krause Publications in three volumes. These catalogues are commonly known in the numismatic trade as the World paper money pdf catalogues, as the numbering system was originally compiled by Albert Pick. Since the mid-1980s the titles have been owned by Krause Publications, and since 1994 have been under the editorship of George S.
20th century notes issued with replacement serial numbers would also have the letter r. Color trials bear the variant letters ct. When multiple specimens are known, then the format used is s1, s2. This is updated every two years or so.
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There are many kinds of money in the world. Most countries have their own kind of money, such as the United States dollar or the British pound.
Most of the time a state or a government prints paper money and makes coins at a mint. The idea of bartering things is very old. A long time ago, people did not buy or sell with money. Instead, they traded one thing for another to get what they wanted or needed.
One person who owned many cows could trade with another person who owned much wheat. Each would trade a little of what he had with the other. This would support the people on his farm. Other things that were easier to carry around than cows also came to be held as valuable.