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- [sdu.stu.gm]sciences of the universe [physics]/earth sciences/geomorphology7
- [sde]environmental sciences5
- [sdu.stu.hy]sciences of the universe [physics]/earth sciences/hydrology5
- [sdu.envi]sciences of the universe [physics]/continental interfaces, environment4
- soil erosion4
- watersheds4
- [sdu.envi] sciences of the universe [physics]/continental interfaces, environment3
- [sdu.stu.gm] sciences of the universe [physics]/earth sciences/geomorphology3
- [sdu.stu.hy] sciences of the universe [physics]/earth sciences/hydrology3