871![](https://www.pdfsearch.io/img/41ef88ab772798c10f47012bf7a3fb46.jpg) | Add to Reading ListSource URL: www.dcnr.state.pa.usLanguage: English - Date: 2013-02-25 14:42:13
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872![](https://www.pdfsearch.io/img/d6642f937170273b460c209671b82650.jpg) | Add to Reading ListSource URL: fracfocus.org- Date: 2011-03-02 11:46:30
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873![](https://www.pdfsearch.io/img/4ef1e9465fa0ef4962be094ba817815e.jpg) | Add to Reading ListSource URL: tyndall.ac.ukLanguage: English - Date: 2011-01-16 03:06:04
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874![](https://www.pdfsearch.io/img/25ec8455ec6d4cf2b425c6e1ad824abd.jpg) | Add to Reading ListSource URL: environment.yale.eduLanguage: English - Date: 2012-09-27 17:06:30
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875![](https://www.pdfsearch.io/img/6285de8b3e2f603bbb0702a857a68f27.jpg) | Add to Reading ListSource URL: ar.water.usgs.govLanguage: English - Date: 2012-03-13 11:52:10
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876![](https://www.pdfsearch.io/img/25dba87a9964a749f4a05eefb01f6f4c.jpg) | Add to Reading ListSource URL: www.netl.doe.govLanguage: English - Date: 2013-07-10 21:26:59
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877![](https://www.pdfsearch.io/img/24fbc049bd17ffd18aadfe768a29e8ff.jpg) | Add to Reading ListSource URL: www.netl.doe.govLanguage: English - Date: 2013-07-10 21:16:07
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878![](https://www.pdfsearch.io/img/f15c03dc7265bde182942aa866135f52.jpg) | Add to Reading ListSource URL: www.netl.doe.govLanguage: English - Date: 2002-02-04 10:21:10
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