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| Key Indicators of County Growth 1970-2025 |
| Historical and projected data files for twelve key indicators of composition and change... [more info] |
| Reference Desk |
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| Kimball's Biology Pages |
| Searchable current textbook in biology. Includes chapters on cell biology, DNA & RNA, embryonic development, ecology, evolution, genetics, immunology, and physiology. [more info] |
| Internet |
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