Desertification and soils policy: Managing soil resources to meet the challenges to mankind symposia papers III / Transactions 12th International congress of soil science - New Delhi: 12th International Congress of Soil Science, 1982 - vi, 166p. Subjects--Topical Terms: Agriculture Subjects--Index Terms: Soil matter Nitrogen Universal Decimal Class. No.: I 631.4(082.2) / M2.4