Parkinson, D. Methods for studying the ecology of soil micro-organisms - Oxford : Blackwell, 1971 - 116 p. : ilus. - IBP Handbook ; 19 . - IBP Handbook ; 19 . LCCN: 37491 Subjects--Topical Terms: Suelos--EcologĂa.Suelos--MicrobiologĂa. Dewey Class. No.: 631.46 / P3