G Keywords GBENGY (2D3D) GBMOBI (2D3D) GENAXS (3D) GENCTC (2D3D) GENDB (2D3D) GENGEO (2D3D) GENSUB (3D) GENTDB (2D3D) GEO23 (2D3D) GEOERR (2D3D) GEOPR2 GEOPR3 GEOSEC (2D3D) GEOTYP (2D) GFREAD (2D3D) GRAIN (2D3D) GRNDAT (2D3D) GRNMDL (2D3D)