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![Testimony of Mariners [microform] : Regarding the Efficiency of the Automatic Acetylene Gas Buoys & Beacons](/_next/image?url=https%3A%2F%2Fstorage.googleapis.com%2Fmenrva_img_storage%2Fcovers%2F9780665789212_ba4ec491.jpg&w=3840&q=80)