File:Mine workers of the Đông Triều coal company inside an underground tunnel supported by mine props (Les charbonnages du Đông Triều, Hanoi, Imprimérie d’Extrême-Orient, 1942, 19).jpg
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![File:Mine workers of the Đông Triều coal company inside an underground tunnel supported by mine props (Les charbonnages du Đông Triều, Hanoi, Imprimérie d’Extrême-Orient, 1942, 19).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Mine_workers_of_the_%C4%90%C3%B4ng_Tri%E1%BB%81u_coal_company_inside_an_underground_tunnel_supported_by_mine_props_%28Les_charbonnages_du_%C4%90%C3%B4ng_Tri%E1%BB%81u%2C_Hanoi%2C_Imprim%C3%A9rie_d%E2%80%99Extr%C3%AAme-Orient%2C_1942%2C_19%29.jpg/800px-thumbnail.jpg?20230716135159)
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