https://commons.ru.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 A study of the errors involved in the sampling of soils https://commons.ru.ac.za/vital/access/manager/Repository/vital:4505 Thu 13 May 2021 04:49:26 SAST ]]> A statistical study of the errors involved in the sampling and chemical analysis of soils and plants, with particular reference to citrus and pineapples https://commons.ru.ac.za/vital/access/manager/Repository/vital:4506 Thu 13 May 2021 04:21:46 SAST ]]>