21 | Add to Reading ListSource URL: cber.cba.ua.eduLanguage: English - Date: 2010-04-22 15:45:02
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22 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2006-02-14 15:14:12
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23 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2005-07-01 14:30:16
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24 | Add to Reading ListSource URL: www.oilheritage.orgLanguage: English - Date: 2006-04-12 16:00:17
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25 | Add to Reading ListSource URL: www.rural.palegislature.usLanguage: English - Date: 2012-11-02 15:00:44
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26 | Add to Reading ListSource URL: www.rural.palegislature.usLanguage: English - Date: 2012-11-08 08:23:00
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27 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-05-15 11:27:06
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28 | Add to Reading ListSource URL: www.parecovery.orgLanguage: English - Date: 2012-10-23 17:04:30
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29 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-02-04 11:29:13
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30 | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-06-25 08:33:17
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