William Mitchell

Engineering Counterparts Engineering Counterparts- Brief biographies and portraits of engineers associated with Ketchum. Henry George Clopper Ketchum Henry George Clopper Ketchum- Virtual exhibit from the University of New Brunswick. Features biography, manuscripts and printed materials, photographs, technical and architectural… Henry George Clopper Ketchum Henry George Clopper Ketchum- Biography by Edward Chapman Bowes from the Canadian Biography Online.