共 8 条
- [1] MEYER AH, 1916, USDA BUR SOILS, P38
- [2] PAMMEL LH, 1915, P ACAD SCI, V22, P23
- [3] POOL RJ, 1918, U NEBR STUDIES, V18, P1
- [4] Pound R., 1900, PHYTOGEOGRAPHY NEBRA
- [5] Shimek B., 1915, B STATE U, V7, P3
- [6] SHIMEK B, 1911, B STATE U, V62, P169
- [7] SHIMEK B, 1911, BOTANICAL REPORT IN, V20, P426
- [8] Vestal A.G., 1918, TRANS ILL STATE ACAD, V11, P122