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576283 Investigators' Digital Photography Reconstruction of section of slate roof ffotograff
581757 Investigators' Digital Photography Reconstruction of section of slate roof, with scale ffotograff
581758 Investigators' Digital Photography Reconstruction of section of slate roof ffotograff
581759 Investigators' Digital Photography Reconstruction of section of slate roof, with scale ffotograff
581760 Investigators' Digital Photography Slate with drilled holes, probably for shaping ffotograff
581761 Investigators' Digital Photography Slate with drilled holes, probably for shaping, with scales ffotograff
581762 Investigators' Digital Photography Detail of drilled slate ffotograff
581763 Investigators' Digital Photography Detail of drilled slate, with scale ffotograff
581764 Investigators' Digital Photography Ridge slate with nail ffotograff
581765 Investigators' Digital Photography Ridge slate with nail and scale ffotograff