| 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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| 0669-A+01 | Volume 03 | 1939 | 0670 | Volume 03 | 1939 |
| This page references page 673 This page is referenced from page 674 |
| 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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