_:b15617 . _:b16281 _:b17330 . . _:b15618 . _:b15618 . _:b15616 . _:b15616 _:b17764 . "StructureGrade"@en . _:b16281 . _:b15617 . _:b15616 . _:b15616 . _:b15617 . _:b15618 . _:b17764 _:b16281 . "Guidelines for Soil Description issued by the FAO: table 47"@en . _:b17330 . . _:b15617 . _:b15618 . _:b17330 .