西安和宝鸡第5层古土壤铁质粘土结核的发现与研究
赵景波
The Discovery and Research on the Ferriferous Clay Nodules of 5th Paleosol Layer in Xi'an and Baoji
ZHAO Jing-bo
地理科学 . 2002, (4): 420 -425 .  DOI: 10.13249/j.cnki.sgs.2002.04.420