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Keywords: First Triangular Surveying of Sasago Pass.jpg ja 第1回笹子峠三角測量を示す図 中央 線笹子トンネルの建設のための測量 1896年 en Map showing first triangular surveying of Sasago pass Yamanashi Japan Survey for construction of Sasago tunnel of Chuo mainline conducted in 1896 1896 国鉄道協会会報第5巻第2号付録図 Imperial Japanese Government Railways / 官設鉄道 Custom license marker 2012 12 24 PD-Japan-organization Uploaded with UploadWizard Sasago Tunnel Chūō Main Line Triangulation |