. _:b11883 . _:b11873 _:b11880 . _:b11878 . _:b11883 . _:b11880 . "Guidelines for Soil Description issued by the FAO: table 13"@en . _:b11880 . _:b11878 . _:b11873 . _:b11878 . _:b11882 . _:b11879 _:b11873 . _:b11883 . "SurfaceAge"@en . _:b11882 . . _:b11878 _:b11879 . _:b11883 . _:b11882 . _:b11882 .