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john-n: Under the CPT truck
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john-n: Assembling GPR antenna cart
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john-n: GPR receiver backpack
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john-n: GPR antenna cart
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john-n: 25 ton CPT truck
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john-n: James dicussing trench photos
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john-n: Climbing in trench
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john-n: James discussing trench
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john-n: James discussing apparent faults in trench
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john-n: Trench
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john-n: Dad
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john-n: Trench shores
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john-n: Dad and Bob
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john-n: Sledgehammers equipped with seismograph triggers
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john-n: Dad laying tape
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john-n: Geophone cable
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john-n: Laying geophone cable
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john-n: Geophone
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john-n: Observing seismograph
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john-n: Observing seismograph
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john-n: CPT log
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john-n: Observing shots on the toughbook
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john-n: Mitchell shooting