Du Toit, Heinrich Sebastian, 1874-1933Toit, Heinrich Sebastian du, 1874-19332011-06-072011-06-071929http://hdl.handle.net/2263/1671366 p. : ill. ; 21 cm.PaperenElectronic copy: University of Pretoria; Printed copy: Public domain.631.450968Soil conservation -- South africaBook