@article{ref1,
title="The Mississippi Valley earthquake problem",
journal="Bulletin of the Seismological Society of America",
year="1930",
author="Macelwane, James B.",
volume="20",
number="2",
pages="95-98",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0037-1106",
doi="",
url="http://dx.doi.org/"
}