Reviewing classical studies in soil physics “Allophane in some Ando soils” N. Yoshinaga and S. Aomine Soil Sci.Plant Nutr. 8, No. 2, 6-13 (1962) and “Imogolite in some Ando soils” N. Yoshinaga and S. Aomine Soil Sci.Plant Nutr. 8, No. 3, 22-29 (1962)