zoom-out Zoom Out zoom-in Zoom In invert Invert cursor Bigger Cursor brightness Brightness contrast Contrast monochrome Grayscale revert Undo Changes Characterization of Air-borne Particles From Mining and Industries Research Authors Mohamed Abuel kassem, Audrey D Levine, Mostafa Elbeblawi and A.S. Abdel Khalik Research Member Mohamed Abuel-Kassem Mohamed Research Department Mining and Metallurgical Engineering Department Research Year 1992