6 1 10 Nasir, Zafar Mueen Additional Author mixed material International Labour Conference on Chemical Industries ( 10th : 1988 : Geneva, Switzerland). Additional Author mixed material Jankowski, Gene F. Additional Author mixed material Gregory, Paul R. Additional Author mixed material بشیر ، محمد Additional Author Majumdar, Somendu B. Additional Author mixed material 70397619 امجد ، امجد اسلام Additional Author بشیر ، محمد Additional Author mixed material