http://dewey.info/scheme/a14/ en
631 Specific techniques; apparatus, equipment, materials
631.4 Soil science
631.401 Philosophy and theory
http://dewey.info/scheme/a14/ vi
631 Kỹ thuật cụ thể; máy móc, thiết bị, vật liệu
631.4 Khoa học đất
631.401 Triết học và lý thuyết
http://dewey.info/scheme/a14/ it
631 Specifiche tecniche; apparecchi, attrezzature, materiali
631.4 Pedologia
631.401 Filosofia e teoria
http://dewey.info/scheme/edition/e23/ en
631 Specific techniques; apparatus, equipment, materials
631.4 Soil science
631.41 Soil chemistry 631.42 Soil fertility, acidity, alkalinity 631.43 Soil physics 631.44 Soil classification 631.45 Soil erosion 631.46 Soil biology 631.47 Soil and land-use surveys 631.49 History, geographic treatment, biography of soil science
Dewey Decimal Classification
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