1. DIN ISO 10 381-1/4 Soil Quality - Sampling, Part 1: Guidance on the Design of Sampling Programmes 1994; Part 4: Guidance on the Investigation of Natural, Near Natural, and Cultivated Sites 1994
2. DIN ISO 10 381-2 Soil Quality - Sampling, Part 2: Guidance on Sampling Techniques 1994
3. DIN ISO 10 381-3 Soil Quality - Sampling, Part 3: Guidance on Safety 1994