Columbia subject headings:
Geomorphology--South Africa--Vaal River Watershed.
Sediments (Geology)--South Africa--Vaal River Watershed.
Harvard subject headings:
Geomorphology--South Africa--Vaal River watershed.
Sediments (Geology)--South Africa--Vaal River watershed.
Princeton subject headings:
Geomorphology--South Africa--Vaal River watershed.
Sediments (Geology)--South Africa--Vaal River watershed.