Guidelines for the description and coding of soil data / E.J. van WaverenISRIC soil information system : user manual : technical manual / E.J. van WaverenGuidelines for the description and coding of soil data / E.J. van Waveren and A.B. BosISRIC soil information system : user manual : technical manual / E.J. van Waveren and A.B. BosGuidelines for the description and coding of soil data / E.J. van Waveren, A.B. BosGuidelines for the description and coding of soil data / E.J. van Waveren