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2. Sheldon coin grading scale - Wikipedia

   en.wikipedia.org/wiki/Sheldon_coin_grading_scale

   Example of an Early American Cent - the coins that inspired Sheldon to create a more precise grading scale. (Courtesy of the National Numismatic Collection, National Museum of American History [photograph by Jaclyn Nash].) The Sheldon Coin Grading Scale is a 70-point coin grading scale used in the numismatic assessment of

3. A Guide Book of United States Coins - Wikipedia

   en.wikipedia.org/wiki/A_Guide_Book_of_United...

   In addition, the Red Book lists commemorative coins, mint sets and proof sets, and bullion coins, as well as significant U.S. pattern coins, private and territorial gold, Hard-times tokens and Civil War tokens. Also listed are Confederate issues, Hawaiian tokens and coins, Philippine issues and Alaskan tokens.

4. Sacagawea dollar - Wikipedia

   en.wikipedia.org/wiki/Sacagawea_dollar

   The coin generally failed to meet consumer and business demands but it is still generally accepted in circulation. These coins have a copper core clad by manganese brass, giving them a distinctive golden color. The coin features an obverse designed by Glenna Goodacre of Sacagawea, the Shoshone guide of the Lewis and Clark Expedition, carrying ...

5. United States Mint coin sizes - Wikipedia

   en.wikipedia.org/wiki/United_States_Mint_coin_sizes

   In particular, many silver coins changed in the 1870s. [4] The figures cited in the tables are representative of the series, and are generally the latest, or most common, figures for a given coin type. The largest coin ever minted by the US Mint was the 2019 Apollo 50th anniversary 5ounce silver dollar, weighing 155.517 grams, and 76.2 mm in ...

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7. Change-making problem - Wikipedia

   en.wikipedia.org/wiki/Change-making_problem

   Coin values can be modeled by a set of n distinct positive integer values (whole numbers), arranged in increasing order as w 1 through w n.The problem is: given an amount W, also a positive integer, to find a set of non-negative (positive or zero) integers {x 1, x 2, ..., x n}, with each x j representing how often the coin with value w j is used, which minimize the total number of coins f(W)

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9. Balance puzzle - Wikipedia

   en.wikipedia.org/wiki/Balance_puzzle

   1) Subdivide the coins in to 2 groups of 4 coins and a third group with the remaining 5 coins. 2) Test 1, Test the 2 groups of 4 coins against each other: a. If the coins balance, the odd coin is in the population of 5 and proceed to test 2a. b. The odd coin is among the population of 8 coins, proceed in the same way as in the 12 coins problem.