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ophis: 60-acre gravel pit, Oak Bluffs
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ophis: SE corner
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ophis: stockpiled sand
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ophis: more stockpiles
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ophis: conveyor
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ophis: old stockpiles
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ophis: S end W side
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ophis: S end W side
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ophis: generalized cross-section of outwash soils
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ophis: stratified sands
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ophis: stratified sands in black and white
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ophis: floor of pit