Columbia subject headings:
Geology--Africa, Eastern.
Rifts (Geology)--Great Rift Valley.
Sediments (Geology)--Great Rift Valley.
Harvard subject headings:
Great Rift Valley.
Rifts (Geology)--Africa
Sedimentation and deposition--Great Rift Valley--Congresses.
Sedimentation and deposition--Great Rift Valley.
Princeton subject headings:
Sedimentation and deposition--Great Rift Valley--Congresses.