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Soils are organized into groups with similar: 1. Observed Properties (field or lab). NATURAL CLASSIFICATION SYSTEM – Soil Taxonomy. The WRB is a soil classification system for naming soils and creating soil map legends. file: ftp://ftp.fao.org/agl/agll/docs/wsrr103e.pdf. A Basic System of Soil Classification for. Making and Interpreting Soil Surveys. Second Edition, 1999. United States Department of Agriculture. (a) It has to classify the higher units, to group the major soil types of the world according to the genesis of their basic properties and thus provide a.UNIFIED SOIL CLASSIFICATION AND SYMBOL CHART. COARSE-GRAINED SOILS. (more than 50% of material is larger than No. 200 sieve size.) GRAVELS. More than 50%. CONTENTS: Soil classification, USCS system, AASHTO system, Textural classification. 5.1 SOIL CLASSIFICATION. Soils are all different, depending on their Classification of Soils for Engineering Purposes (Unified Soil Classification System)'. Payal Parnami. DownloadDownload PDF. Full PDF PackageDownload Full