21 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2001-03-30 10:57:46
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22 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2001-03-30 10:57:51
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23 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2000-12-12 14:18:00
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24 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2002-04-11 06:39:18
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25 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2000-12-08 08:22:57
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26 | Add to Reading ListSource URL: pa.water.usgs.govLanguage: English - Date: 2002-04-11 06:39:18
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27 | Add to Reading ListSource URL: www.psie.psu.edu- Date: 2008-08-18 10:46:26
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28 | Add to Reading ListSource URL: brandbjerg.dkLanguage: Danish - Date: 2013-02-07 11:36:42
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29 | Add to Reading ListSource URL: www.snipesfarm.orgLanguage: English - Date: 2015-02-26 17:57:29
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30 | Add to Reading ListSource URL: www.askov-hojskole.dkLanguage: Danish - Date: 2014-12-21 14:56:15
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