Columbia subject headings:
Erosion--Congresses.
Geomorphology--Congresses.
Rivers--Congresses.
Sedimentation and deposition--Congresses.
Harvard subject headings:
Erosion--Congresses.
Geomorphology--Congresses.
Rivers--Congresses
Sedimentation and deposition--Congresses.
Princeton subject headings:
Erosion--Congresses.
Geomorphology--Congresses.
Rivers--Congresses.
Sedimentation and deposition--Congresses.