_:b15747 . _:b15747 _:b17805 . . _:b15747 . _:b15748 . "Guidelines for Soil Description issued by the FAO: table 76"@en . _:b15749 . _:b17371 . _:b15749 . _:b16322 _:b17371 . _:b17371 . _:b15749 . "MineralConcHardness"@en . _:b15748 . _:b15747 . _:b15748 . _:b15748 . . _:b15749 . _:b16322 . _:b17805 _:b16322 .