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21Subjects: “...Hydrogeology Pennsylvania Valley Forge National Historical Park....”
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22
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23Subjects: “...Hydrogeology Pennsylvania Newville Region (Cumberland County)...”
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24by Sloto, Ronald A.Subjects: “...Hydrogeology Pennsylvania Chester County....”
Published 1997
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25
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26Subjects: “...Hydrogeology Pennsylvania Luzerne County Observations....”
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27Subjects: “...Hydrogeology https://id.loc.gov/authorities/subjects/sh85063439 Pennsylvania Bucks County. https...”
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28Published 2005Subjects: “...Hydrogeology Pennsylvania Spring Creek Watershed (Centre County)...”
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29by Sloto, Ronald A.Subjects: “...Hydrogeology Pennsylvania Chester County....”
Published 1990
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30
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31by Sloto, Ronald A.Subjects: “...Hydrogeology Pennsylvania French Creek Watershed (Berks County and Chester County)...”
Published 2004
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32by Chichester, Douglas C.Subjects: “...Hydrogeology http://id.loc.gov/authorities/subjects/sh85063439 Cumberland Valley (Md. and Pa.) http...”
Published 1996
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