21 | Add to Reading ListSource URL: profile.usgs.govLanguage: English - Date: 2012-06-22 21:15:27
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22 | Add to Reading ListSource URL: profile.usgs.govLanguage: English - Date: 2012-06-25 18:15:35
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23 | Add to Reading ListSource URL: walrus.wr.usgs.govLanguage: English - Date: 2005-11-29 15:29:20
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24 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-06-09 18:55:11
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25 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-06-09 18:55:11
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26 | Add to Reading ListSource URL: profile.usgs.govLanguage: English - Date: 2012-06-22 21:31:23
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27 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2005-06-09 18:54:36
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28 | Add to Reading ListSource URL: geomaps.wr.usgs.govLanguage: English - Date: 2007-08-07 19:43:46
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29 | Add to Reading ListSource URL: geomaps.wr.usgs.govLanguage: English - Date: 2007-12-19 00:16:34
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30 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2012-03-28 15:39:50
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