Adoption, with amendment, of Section 162, pp 348-349 of "Standard Methods for the Examination of Water and Wastewater" - 13th Edition 1971, prepared and published jointly by - American Public Health Association; american Water Works Association; & Water Pollution Control Federation (USA).
Methods of testing soils for engineering purposes, Method 4.1.1: Soil chemical tests - Determination of the organic matter content of a soil - Normal method
