Bengal. Department of Commerce and Industry, Special rules [for coal mines] under Section 21 of the Indian Mines Act, 1901 (VIII of 1901). Calcutta, 1912
Bengal. Department of Commerce and Industry, Special rules [for coal mines] under Section 21 of the Indian Mines Act, 1901 (VIII of 1901). Calcutta, 1913
Bengal. Department of Commerce and Industry, Special rules [for coal mines] under Section 21 of the Indian Mines Act, 1901 (VIII of 1901). Calcutta, 1914