![The classification of some British Soils according to the comprehensive system of the United States : RAGG, JM MACHAULAY INST. SOIL RES. ABERDEEN, GB CLAYDEN, B ROTHAMSTED EXP. STAT. HARPENDEN, GB 15T, 90R. SOIL SURVEY, TECH. MONOGRAPH N3, 1973, 227P]()
The classification of some British Soils according to the comprehensive system of the United States : RAGG, JM MACHAULAY INST. SOIL RES. ABERDEEN, GB CLAYDEN, B ROTHAMSTED EXP. STAT. HARPENDEN, GB 15T, 90R. SOIL SURVEY, TECH. MONOGRAPH N3, 1973, 227P1974