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| A PETROGRAPHIC STUDY OF HEAVY MINERALS OF WISCONSIN IGNEOUS ROCKS, U.S.A | |
| 作者姓名： | 王竹泉 |
| 摘 要： | The use of the heavy minerals in sedimentary rocks as a means for correlation of stratigraphic problem is becoming more and more widespread in recent years, especially in England and United States. Where the rock formations are scanty in fossils or can not be correlated by fossils alone, the study |
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