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  1. 01 Januari 1992 26 pages, tables MFS Series, no. 25
  2. 01 Januari 2024 Many smallholder farmers live in areas with hilly or mountainous terrain. Soil erosion is a major issue in growing crops on steep slopes. When we see contoured plantings across slopes, we know that someone cares about erosion and is doing something about it. The curves are aesthetic, but what do...