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2. The contribution and importance of soil scientists in interdisciplinary studies dealing with land;Bouma,1996
3. Continuous classification in soil survey: spatial correlation, confusion and boundaries;Burrough;Geoderma,1997
4. Mapping the land–aerial imagery for land use information;Campbell,1983
5. The nine-unit landsurface model: an approach to pedogeomorphic research;Conacher;Geoderma,1977