File:Graph of polio cases.PNG
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Graph_of_polio_cases.PNG (400 × 222 pixels, file size: 4 KB, MIME type: image/png)
Summary
This is a graph of reported polio cases in the United States from 1920-1997.
Copyright status
This image is public domain because it was first published by the United States Department of Health and Human Services.
Source
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:30, 31 May 2008 | | 400 × 222 (4 KB) | Ashcraft (talk | contribs) | |
| 04:46, 1 May 2008 |  | 400 × 241 (6 KB) | Cjimmy (talk | contribs) | This is a graph of reported polio cases in the United States from 1920-1997. |
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