CODES FOR SAMPLE DATA Column name Column descriptor Codes Samp_Pu QAQC samples "SD = Sample duplicate, QS = Standard" Descr 1 Soil type "RE = residual, SA = sand, SH = sheetwash. Amount of material: H = high, M = moderate, L = low" Descr 2 Vegetation "SP = spinifex, M = mulga, H = herbaceous plants, EU = eucalypts, SH = shrubby"