File:Radon Lognormal distribution.gif
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| Description |
English: Day Care Radon concentration survey in North Dakota 1991-1992, showing a Lognormal distribution.
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| Date | 1991-1992 |
| Source | http://www.ndhealth.gov/aq/iaq/radon/day9192.htm |
| Author | Dakota Department of Human Services |
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