US Department of Labor, Standard Industrial Classification Manual 1987… (1987 | noyear)
“ Mining And Quarrying Of Nonmetallic Minerals, Except Fuels This major group includes establishments primarily engaged in mining or quarrying, developing mines, or exploring for nonmetallic minerals, except fuels. ”
US Department of Labor, Standard Industrial Classification Manual 1987… (1987 | noyear)
“ Establishments primarily engaged in manufacturing other stone, clay, glass, and concrete products from minerals mined at the same establishment are classified in Manufacturing, Major Group 32, when separate reports are not available for the mining and manufacturing activities. ”
