 Interior, to make diligent investigation of the methods of mining, especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on,...  Technological Mobilization: Hearings, Oct. 13, 21-22, 27, Nov. 17-18, 1942 - Página 176por United States. Congress. Senate. Committee on Military Affairs. Subcommittee on Technological Mobilization - 1942Visualização integral - Acerca deste livro
 | United States. Congress. House. Committee on Interior and Insular Affairs - 1965 - 390 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
 | United States. Congress. House. Committee on Interior and Insular Affairs - 1965 - 998 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
 | United States. Congress. House. Committee on Interior and Insular Affairs - 1965 - 1596 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
 | 1969 - 1404 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
 | United States. Congress. House. Committee on Education and Labor - 1970 - 1610 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
 | United States. Congress. House. Committee on Education and Labor - 1970 - 1202 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
 | Mary C. Rabbitt, Clifford M. Nelson - 1986 - 508 páginas
...especially in relation to the safety of miners, and the appliances best adapted to prevent accidents, the possible improvement of conditions under which mining operations are carried on, the treatment of ores and other mineral substances, the use of explosives and electricity, the prevention... | |
| |
