Here&#x27;s the source that I was attempting to recall (I need to reread it myself):<p><a href="http:&#x2F;&#x2F;www.sciencemag.org&#x2F;content&#x2F;316&#x2F;5825&#x2F;736" rel="nofollow">http:&#x2F;&#x2F;www.sciencemag.org&#x2F;content&#x2F;316&#x2F;5825&#x2F;736</a><p>I can&#x27;t find a link to back up 28 miles, but the site you referenced has two or three in the 17-22 mile range that look encouraging. I&#x27;m not certain that those numbers include forest roads in the measurement though; it might be just distance from public roads.<p>The River of No Return Wilderness looks amazing - thanks!