Flow-diagram keys for “soil taxonomy”: A. Diagnostic horizons and properties: mineral soils; B. soil moisture and temperature regimes, and diagnostic horizons and properties for organic soils; C. The key to soil orders; D. histosols and spodosols: R.F. Thomas, L.C. Blakemore and D.I. Kinloch. New Zealand Soil Bureau Scientific Report 39 A, B, C, D. Department of Scientific and Industrial Research, New Zealand, 1979, 112 pp., 48 pp., 40 pp. and 102 pp., resp