|Soil in Leyte having a dark surface horizon due to OM|
|The old soil mineralogy lab at the Univ Halle-Wittenberg|
|Clay collection for mineralogical analysis|
Mikutta R, Kleber M, Kaiser K and Jahn R. 2005. Organic matter removal from soil using hydrogen peroxide, sodium hypochlorite, and disodium peroxodisulfate. Soil Science Society of America Journal 69: 120-135.