共 6 条
- [1] ALDERN WC, 1915, IOWA GEOL SURV, V26, P156
- [2] BAKER FT, COMMUNICATION
- [3] Weathered zones of the drift-sheets of Illinois [J]. JOURNAL OF GEOLOGY, 1930, 38 (01) : 28 - 53
- [5] LEVERETT F, 1929, US GEOL SURV, pA154
- [6] LEVERETT F, 1896, US GEOL SURV MONO, V38, P153