共 7 条
- [1] BRIGGS LJ, 1898, USDA BUR SOILS B, V10
- [2] BRIGGS LJ, 1898, US DEP AGR YB, P399
- [3] Buckingham E., 1907, USDA BUR SOILS B, V38
- [4] CAMERON FK, 1905, SCI ABST 9 A, V22, P416
- [6] SLICHTER CS, 1898, US GEOL SURVEY 19 2, P330
- [7] WIDTSOE JA, 1912, UTAH AGR EXP STA B, V115, P217