Motoki Yamazaki was the last president of Mantetsu, and closely engaged in the internal decisions of the last days of Mantetsu and led the negotiation with U.S.S.R. concerning takeovers of the railway business and closing of the company. This collection includes all materials related to
Mantetsu from his private library, now possessed by Odawara Municipal Library, and inevitable resource to shed light on unsolved aspects of Mantetsu.