File:The Shenandoah Limestone and Martinsburg Shale.pdf
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![File:The Shenandoah Limestone and Martinsburg Shale.pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/The_Shenandoah_Limestone_and_Martinsburg_Shale.pdf/page1-416px-The_Shenandoah_Limestone_and_Martinsburg_Shale.pdf.jpg?20150310184324)
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