@Misc{Brown2002,
author="Brown, J.
and Ferrians Jr, O. J.
and Heginbottom, J. A.
and Melnikov, E. S.",
title="Circum-Arctic Map of Permafrost and Ground-Ice Conditions. Version 2. [indicate subset used]",
year="2002",
publisher="National Snow and Ice Data Center",
address="Boulder, Colorado USA"
}