21 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2015-04-08 15:10:58
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22 | Add to Reading ListSource URL: www.geopark.atLanguage: English - Date: 2010-01-26 10:57:30
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23 | Add to Reading ListSource URL: www.sonycentre.caLanguage: English - Date: 2013-10-07 14:05:59
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24 | Add to Reading ListSource URL: s3.amazonaws.comLanguage: English - Date: 2014-02-18 21:26:38
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25 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2006-11-13 11:01:43
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26 | Add to Reading ListSource URL: www.chs.helena.k12.mt.usLanguage: English - Date: 2007-04-03 15:11:39
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27 | Add to Reading ListSource URL: www.au.agwscam.comLanguage: English - Date: 2010-09-22 23:14:16
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28 | Add to Reading ListSource URL: www.heritagepreservation.org- Date: 2012-07-22 13:40:11
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29 | Add to Reading ListSource URL: irkpa.orgLanguage: English - Date: 2014-03-20 08:29:38
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30 | Add to Reading ListSource URL: www.nps.govLanguage: English - Date: 2014-10-20 14:16:47
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