Hartu hau. : Humic substances [electronic resource] : structures, models and functions / edited by Elham A. Ghabbour, Geoffrey Davies.

Izenburua : Humic substances [electronic resource] : structures, models and functions / edited by Elham A. Ghabbour, Geoffrey Davies.

Sailkapena : Ez dago telefono-zenbakirik.

Egoera : Ezezaguna