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Astrogeology1
Grabens (Geology)1
Impact craters1
Physical geography1
Planetary science2
Planets--Orbits1
Planets--Rotation1
Plate tectonics1
Topographical surveying1

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Academic Commons provides global access to research and scholarship produced at Columbia University, Barnard College, Teachers College, Union Theological Seminary and Jewish Theological Seminary. Academic Commons is managed by the Columbia University Libraries.