441 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2002-04-22 05:32:35
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442 | Add to Reading ListSource URL: www.usbr.govLanguage: English - Date: 2012-12-31 16:11:22
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443 | Add to Reading ListSource URL: goldandcoal.comLanguage: English - Date: 2013-04-03 21:01:05
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444 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2006-06-08 12:49:27
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445 | Add to Reading ListSource URL: parkcountylibrary.orgLanguage: English - Date: 2014-07-23 16:53:13
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446 | Add to Reading ListSource URL: region8water.colostate.eduLanguage: English - Date: 2011-04-11 12:24:31
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447 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-02-25 13:14:42
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448 | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2000-02-25 13:30:24
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449 | Add to Reading ListSource URL: www.nature.nps.govLanguage: English - Date: 2001-07-06 12:56:41
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450 | Add to Reading ListSource URL: goldandcoal.comLanguage: English - Date: 2013-04-03 21:00:01
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