Index of ftp://ftp.ngdc.noaa.gov/ionosonde/documentation/station
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![[DIR]](/icons/folder.gif) BC840 | 4.00b | November 26 2008 |
| DB049 | 5.00b | October 7 2009 |
| GR13L | 4.00b | October 7 2009 |
| JI91J | 4.00b | October 7 2009 |
| SMJ67 | 4.00b | November 26 2008 |
| TR169 | 5.00b | October 7 2009 |
| WI937 | 5.00b | November 26 2008 |
| WP937 | 4.00b | October 7 2009 |