共 4 条
- [1] TOTAL DUST, COAL, FREE SILICA, AND TRACE METAL CONCENTRATIONS IN BITUMINOUS COAL MINERS LUNGS AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL, 1971, 32 (07): : 432 - +
- [2] TOTAL DUST, COAL, FREE SILICA, AND TRACE METAL CONCENTRATIONS IN BITUMINOUS COAL MINERS LUNGS AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL, 1970, 31 (02): : 6 - &