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  2. Little Rock Central High School Desegregation silver dollar

    en.wikipedia.org/wiki/Little_Rock_Central_High...

    The Little Rock Central High School Desegregation silver dollar is a commemorative coin issued by the United States Mint in 2007. [1] The coin commemorates the desegregation of the Little Rock Central High School in the fall of 1957 when nine African-American students enrolled in the school in compliance with the U.S. Supreme Court decision in Brown v.

  3. List of United States commemorative coins and medals (1920s)

    en.wikipedia.org/wiki/List_of_United_States...

    Coin Obverse design Reverse design Composition Mintage Available Obverse Reverse 50¢ Maine Centennial half dollar: Arms of Maine: Pine wreath 90% Ag, 10% Cu: Authorized: 100,000 (max) Uncirculated: 50,028 [1] 1920 50¢ Pilgrim Tercentenary half dollar: Governor William Bradford: The Mayflower: 90% Ag, 10% Cu Authorized: 300,000 (max 1920-1921 ...

  4. Ecological efficiency - Wikipedia

    en.wikipedia.org/wiki/Ecological_efficiency

    The ecological efficiency of an ecosystem is as a result often no better than an approximation. On the other hand, an approximation may be enough for most ecosystems, where it is important not to get an exact measure of efficiency, but rather a general idea of how energy is moving through its trophic levels .

  5. 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.

  6. Ecosystem ecology - Wikipedia

    en.wikipedia.org/wiki/Ecosystem_ecology

    Ecosystem ecology is the integrated study of living and non-living components of ecosystems and their interactions within an ecosystem framework. This science examines how ecosystems work and relates this to their components such as chemicals , bedrock , soil , plants , and animals .

  7. Ecosystem - Wikipedia

    en.wikipedia.org/wiki/Ecosystem

    An ecosystem (or ecological system) is a system formed by organisms in interaction with their environment. [2]: 458 The biotic and abiotic components are linked together through nutrient cycles and energy flows. Ecosystems are controlled by external and internal factors.

  8. The Coin Collector's Survival Manual - Wikipedia

    en.wikipedia.org/wiki/The_Coin_Collector's...

    The Numismatic Literary Guild (NLG) gave The Coin Collector's Survival Manual twelve awards, including "Book of the Year" in 1984 and in 2006 for the fifth edition, where it was tied. [6] [7] The revised seventh edition was named "Best Investment Book" in 2016. [8] The book has been cited in various news articles as authoritative about ...

  9. Energy flow (ecology) - Wikipedia

    en.wikipedia.org/wiki/Energy_flow_(ecology)

    Autochthonous carbon comes from within the ecosystem and includes aquatic plants, algae and phytoplankton. Allochthonous carbon from outside the ecosystem is mostly dead organic matter from the terrestrial ecosystem entering the water. [16] In stream ecosystems, approximately 66% of annual energy input can be washed downstream.

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