![Potash shales of Illinois / [by S.W. Parr and M.M. Austin]. Geology, distribution, and occurrence of the potash-bearing shale of Union County / [by Frank Krey]. Finely-ground shale as a source of potassium for soil improvement / [by Robert Stewart]](/search/themes/bootstrap3/images/libros.png)
Potash shales of Illinois / [by S.W. Parr and M.M. Austin]. Geology, distribution, and occurrence of the potash-bearing shale of Union County / [by Frank Krey]. Finely-ground shale as a source of potassium for soil improvement / [by Robert Stewart]
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| Format: | Texto biblioteca |
| Language: | d |
| Published: |
Urbana, Ill. : University of Illinois Agricultural Experiment Station,
1921
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| Subjects: | POTASH DEPOSITS-ILLINOIS, SHALE-ILLINOIS, Krey, Frank. Geology, distribution, and occurrence of the potash-bearing shale of Union County, Stewart, Robert, Finely-ground shale as a source of potassium for soil improvement, Geology, distribution, and occurrence in Union County, |
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