. "1994-06-09T00:00:00Z"^^ . . . . . . . . . . . . . . . . . . . . . . "10.26616/NIOSHSFACE94MA010" . . . . . "Massachusetts concrete plant driver/yardman asphyxiated in materials hopper"@en . . . . . . . . . . . "20028424" . "Massachusetts concrete plant driver/yardman asphyxiated in materials hopper"@en . . . "Massachusetts concrete plant driver/yardman asphyxiated in materials hopper"@en . "field study published in 1994"@en . "Massachusetts concrete plant driver/yardman asphyxiated in materials hopper"@en . . .