MAP20110068875 Johnson, Ashley Not an easy task : dramatic safety improvement starts with safety culture / Ashley Johnson Sumario: In May, a report issued by an independent investigation team concluded that the upper big branch mine south explosion that killed 29 miners in West Virginia last yaer could have been prevented if mine owner Massey energy Co. had followed basic safety procedures En: Safety and health. - Itasca : National Safety Council, 1993-2017 = ISSN 0891-1797. - 07/11/2011 Tomo 184 Número 5 - 2011 1. Seguridad e higiene en el trabajo . 2. Siniestros . 3. Cultura preventiva . 4. Medidas de seguridad .