This report describes an early design for a nuclear reactor to be used for nuclear thermal rocket propulsion. The report, originally classified, was later approved for public release. In 1996, an Adobe Acrobat format version of the report was created by scanning a Los Alamos Library paper copy. The report is 385 pages, and the file size is 13 MB
Primary Download Site: http://lib-www.lanl.gov/la-pubs/00339489.pdf
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As an introduction, and to aid people in deciding whether or not to download the report, here are images of some of the first pages: