Humus acids of soils

Antzeko izenburuak

• Humus acids of soils /
  nork: Orlov, D. S.
  Argitaratua: (1985)
• Physical and chemical characteristics of aquatic humus /
  nork: Gjessing, Egil T.
  Argitaratua: (1976)
• Soil Chemistry
  nork: Orlone, D.S
  Argitaratua: (1992)
• Soil organic matter in sustainable agriculture
  nork: Magdoff, Fred; Editor, et al.
  Argitaratua: (2004)
• Fertilizer additives and soil conditioners
  nork: Ranney, M.William
  Argitaratua: (1978)