@article{ref1,
title="Policy Issues and Problems in Outdoor Recreation",
journal="Journal of farm economics",
year="1967",
author="Frey, JC and Gamble, HB",
volume="49",
number="5",
pages="1307-1317",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1071-1031",
doi="",
url="http://dx.doi.org/"
}