<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Linda J. Bragg</dc:contributor>
  <dc:contributor>Robert B. Finkelman</dc:contributor>
  <dc:creator>Susan J. Tewalt</dc:creator>
  <dc:date>2001</dc:date>
  <dc:description>The U.S. Geological Survey (USGS) has compiled a nationwide coal information database over the last 25 years. A subset of the data, called COALQUAL, contains analyses of over 7,000 coal samples that have been collected or calculated to represent the entire thickness of a coal bed in the ground. The COALQUAL database is an extremely valuable source of information for raw or in-ground trace-element concentrations in U.S. coals and, if adjusted for the effect of coal cleaning in appropriate coals, can provide a first estimate of as-shipped mercury concentration in coal where data are not available.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/fs09501</dc:identifier>
  <dc:language>en</dc:language>
  <dc:title>Mercury in U.S. coal; abundance, distribution, and modes of occurrence</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>