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| | System/390 (Site not responding. Last check: 2007-10-08) |
 | | A wide range of system engineering resources for all those people involved in system engineering, design, soft systems methodologies, system thinking and system dynamics. |
 | | Understanding the Immune System From the National Institutes of Health, a detailed look at the enemies that the immune system fights, the way the immune system recognizes foreign objects, the lymphatic system, antibodies, cells, allergies, autoimmune disorders, HIV, cancer, and tec |
 | | A system of measurement in use in the United Kingdom, now partially superseded by the metric system, and currently in the United States and consisting of units such as the inch, the mile and the pound (a unit of weight). |
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