皂土
参考资料
- Survey, Wyoming State Geological. . www.wsgs.uwyo.edu. [2017-05-13]. (原始内容存档于2012-03-24).
- Hosterman, J.W. and S.H. Patterson. 1992. Bentonite and Fuller's earth resources of the United States. U.S. Geological Survey Professional Paper 1522. United States Government Printing Office, Washington D.C., USA.
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