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5642 Volume 20 31-May-57 5643 Volume 20 1957
Summary: Distinguish between Essential and Vital variables.
Essential variables vital variables
Survival and vital variables
Vital variables defined
This page references 2 pages: 5537 5628
This page is referenced from 6 pages: 5538 5578 5579 5628 5635 5643		 This page references 4 pages: 5578 5642 5537 5574
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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