@article{ref1,
title="The National Occupational Health Survey of Mining",
journal="Morbidity and mortality weekly report. Surveillance summaries : MMWR / Centers for Disease Control",
year="1986",
author="Groce, D. W. and Carr, W. G. and Hearl, F. J.",
volume="35",
number="2",
pages="17SS-22SS",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0892-3787",
doi="",
url="http://dx.doi.org/"
}