Historically Important Collection of Two Albums with ca. 264 Original Photographs, Showing the Executives of the Hokkaido Colliery & Railway Company (Hokutan) on a Post-War Inspection Trip to Hawaii, Washington, Virginia, New Jersey, Philadelphia, and Tennessee, Meeting with American Colleagues, Visiting Local Landmarks, Posing with Floral Leis, etc.; also with the Photos of Wartime Operations in Yubari, Including Mine Workers Wielding Manual Picks in Confined Seams, Female Trainees Displaying Diplomas, Executive Delegations Surveying Surface Infrastructure, etc. First album: ca. 1940s.