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Description	English: "Space Settlements: A Design Study" book, describing Stanford torus proposed space settlement. Charles Holbrow and Richard D. Johnson, National Aeronautics and Space Administration (NASA). 1977. This book is also available in web version: at the website of National Space Society: https://nss.org/settlement/nasa/75SummerStudy/index.html archived version, at Internet Archive: https://web.archive.org/web/20240722133943/https://nss.org/settlement/nasa/75SummerStudy/index.html version previously hosted by NASA, at Internet Archive: https://web.archive.org/web/20130215151852/http://settlement.arc.nasa.gov/75SummerStudy/Table_of_Contents1.html Español: Libro "Space Settlements: A Design Study", que describe la propuesta de asentamiento espacial llamada toro de Stanford. Charles Holbrow y Richard D. Johnson, Administración Nacional de Aeronáutica y del Espacio (NASA). 1977. Este libro también está disponible en versión web: en el sitio web de la National Space Society: https://nss.org/settlement/nasa/75SummerStudy/index.html versión archivada, en Internet Archive: https://web.archive.org/web/20240722133943/https://nss.org/settlement/nasa/75SummerStudy/index.html versión alojada anteriormente por la NASA, en Internet Archive: https://web.archive.org/web/20130215151852/http://settlement.arc.nasa.gov/75SummerStudy/Table_of_Contents1.html
Date	1977
Source	https://archive.org/details/SpaceSettlementsADesignStudy1977
Author	National Aeronautics and Space Administration (NASA). Richard D. Johnson and Charles Holbrow.

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This work is in the public domain in the United States because it was published in the United States between 1931 and 1977, inclusive, without a copyright notice. For further explanation, see Commons:Hirtle chart as well as a detailed definition of "publication" for public art.
Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.

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