1 Subjects: “...gravel-bed stream...”

2 Subjects: “...gravel bed river...”

3 Subjects: “...gravel content...”

4 Subjects: “...gravel beaches...”

5 Subjects: “...gravel-rubber mixtures...”

6 Subjects: “...gravel-rubber mixtures...”

7

8 “.... In addition, shallow groundwater levels and gravel pits increase the vulnerability of the environment even...”