21 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2003-03-04 16:34:36
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22 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-12-18 08:44:08
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23 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2010-10-30 00:03:46
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24 | Add to Reading ListSource URL: www.bucknell.eduLanguage: English - Date: 2015-02-04 18:32:55
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25 | Add to Reading ListSource URL: www.okgeosurvey1.govLanguage: English - Date: 2014-11-03 17:45:50
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26 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2014-08-11 11:50:18
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27 | Add to Reading ListSource URL: dos.myflorida.comLanguage: English - Date: 2014-08-15 15:48:01
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28 | Add to Reading ListSource URL: delawaresourcewater.orgLanguage: English - Date: 2014-10-21 07:36:22
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29 | Add to Reading ListSource URL: www.usgs.govLanguage: English - Date: 2011-11-23 10:11:32
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30 | Add to Reading ListSource URL: www.okgeosurvey1.govLanguage: English - Date: 2014-10-10 11:09:06
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