00334nam a2200097Ia 4500008004100000082002900041100003200070245007900102260004900181300000600230140113s9999    xx            000 0 und d  a624.131.4:543.257.1   L3  aIndian Standard Institution  aMethods of test for soils. Part XXVI. Determination of PH Value. I rev.ed.  a1973bIndian Standard InstitutioncNew Delhi  a7