21 | Add to Reading ListSource URL: www.lgs.lsu.eduLanguage: English - Date: 2007-05-22 16:26:12
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22 | Add to Reading ListSource URL: www.geology.illinois.eduLanguage: English - Date: 2015-08-24 01:57:46
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23 | Add to Reading ListSource URL: crustal.cr.usgs.govLanguage: English - Date: 2016-02-12 18:41:05
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24 | Add to Reading ListSource URL: www.westernstateswater.orgLanguage: English - Date: 2016-03-02 11:13:43
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25 | Add to Reading ListSource URL: datapreservation.usgs.govLanguage: English - Date: 2014-10-21 19:08:57
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26 | Add to Reading ListSource URL: mapcontext.comLanguage: English - Date: 2008-08-30 01:13:15
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27 | Add to Reading ListSource URL: www2.usgs.govLanguage: English - Date: 2014-09-03 14:42:44
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28 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2015-11-18 15:15:19
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29 | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2016-07-13 17:26:25
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30 | Add to Reading ListSource URL: www.mgwa.orgLanguage: English - Date: 2008-12-09 15:54:24
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