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Oak Grove Tunnel, party of officials at northern portal
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Oak Grove project, water filling pond less than one hour after closing dam
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Oak Grove project, view of penstock line from office of Hurley-Mason Company office
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Oak Grove project, view of dam
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Oak Grove project, upstream from lower dam site at intake
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Oak Grove project, slide viewed from camp #4 ½
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Oak Grove project, diamond drill at lower damsite intake
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Oak Grove project, coffer dam at dam site
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Oak Grove project, closing of gates at dam