11 | Add to Reading ListSource URL: www.columbia.eduLanguage: English - Date: 2015-08-28 13:56:11
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12 | Add to Reading ListSource URL: northpennnews.orgLanguage: English - Date: 2015-08-03 12:22:24
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13 | Add to Reading ListSource URL: apps.pittsburghpa.govLanguage: English - Date: 2015-08-06 15:24:35
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14 | Add to Reading ListSource URL: grfx.cstv.comLanguage: English - Date: 2012-01-19 12:17:21
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15 | Add to Reading ListSource URL: www.shaletec.orgLanguage: English - Date: 2015-03-06 17:14:52
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16 | Add to Reading ListSource URL: goodlifeproject.comLanguage: English - Date: 2015-03-02 23:15:58
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17 | Add to Reading ListSource URL: northpenn.clubwizard.com- Date: 2015-04-01 10:32:19
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18 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2012-05-02 15:19:08
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19 | Add to Reading ListSource URL: northpenn.clubwizard.comLanguage: English - Date: 2015-04-17 10:48:56
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20 | Add to Reading ListSource URL: rock.geosociety.orgLanguage: English - Date: 2012-05-02 15:19:08
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