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52![LEAD By Gerald R. Smith Domestic survey data and tables were prepared by Richelle J. Ellis, statistical assistant, and the world production tables LEAD By Gerald R. Smith Domestic survey data and tables were prepared by Richelle J. Ellis, statistical assistant, and the world production tables](https://www.pdfsearch.io/img/3e6d4a856bb83c1d8cc95a53fefc3f66.jpg) | Add to Reading ListSource URL: minerals.usgs.govLanguage: English - Date: 2002-05-08 13:01:48
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53![](https://www.pdfsearch.io/img/0a080ab98579f05f289d7d2502969a93.jpg) | Add to Reading ListSource URL: www.dim.uchile.clLanguage: English - Date: 2010-11-16 06:05:44
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54![](https://www.pdfsearch.io/img/4d3f335fe4fc329281d9cc855ea11f15.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2002-05-28 13:51:00
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55![](https://www.pdfsearch.io/img/79a190fc37ddc7d739e720a2731a24db.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-02-18 15:36:20
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56![](https://www.pdfsearch.io/img/5effc51aa556b1eb3c5e9d771fe07f22.jpg) | Add to Reading ListSource URL: pubs.usgs.govLanguage: English - Date: 2004-02-18 15:31:36
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57![](https://www.pdfsearch.io/img/d11a9582978aeb8f7b9d18319bcca248.jpg) | Add to Reading ListSource URL: geoinfo.nmt.eduLanguage: English - Date: 2010-06-15 16:16:22
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