Du Toit, Heinrich Sebastian, 1874-1933Toit, Heinrich Sebastian du, 1874-19332011-09-272011-09-271929http://hdl.handle.net/2263/1733664 p. : ill. ; 21 cm.PaperAfrikaansCopyright electronic version: University of Pretoria; Copyright original version: Public domainErosion631.450968Soil conservation -- South AfricaBook