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https://hanzama.x0.to/2020/09/23/map-like-map-the-map-of-the-topography-of-the-year-in-1910-was-the-subject-of-the-subject-matter-of-the-subject-matter-fundo/
地図好き集まれ!明治43年当時の地形図をどこでも見放題の神サイトが話題に!(FUNDO)