| This image is reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972, 2008 © The Estate of W. Ross Ashby |
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| 7000 | Volume 25 | 1969 | 7001 | Volume 25 | 1969 |
| This page is referenced from 2 pages: 7027 7047 | This page references 3 pages: 7047 6987 6998 This page is referenced from page 7047 |
| This image is reproduced courtesy of The Estate of W. Ross Ashby. Copyright 1972, 2008 © The Estate of W. Ross Ashby |
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