| 其他書名 | Economic Importance, Present Availability, and Future Development : Presentations and Discussions at a Workshop Held February 15-16, 1989, in Marina Del Rey, Calif. on the Problems Encountered in and Recommendations for Improving the Current and Future Industrial Rock and Mineral-resource Availability in California |
| 出版 | California, Department of Conservation, Division of Mines and Geology, 1990 |
| URL | http://books.google.com.hk/books?id=ETdOAQAAIAAJ&hl=&source=gbs_api |