zoom-out Zoom Out zoom-in Zoom In invert Invert cursor Bigger Cursor brightness Brightness contrast Contrast monochrome Grayscale revert Undo Changes المستوى المعرفى وإدراك المزارعين لظاهرة التلوث البيئى بمحافظة أسيوط Research Department Department of Rural Sociology and Agricultural Extension Research Member Ahmad Abdullatif Ibrahim Mohamed Research Year 1993