Mineral Resources On-Line Spatial Data

Rare earth (lanthanide series) element with symbol Pm and atomic number 61 <http://periodic.lanl.gov/61.shtml>

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U.S. Department of the Interior | U.S. Geological Survey
URL: http://mrdata.usgs.gov/agdb/element.php?symbol=Pm
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Page Last modified: 17:15 on 05-Mar-2012