C93, D83, I10, I31, L82, L86, Z13
O33, G21, I21, J24, D12, D91, C93
C91, D31, I31
C93, D91, J24, J63, M54
C91, D91
D83, D91, G41, L82
J28: Safety • Job Satisfaction • Related Public Polic, J81: Working Conditions, I31: General
I10, I12, I18, D83, D91
D63, H21, I31
C90, D72, D91