Utah's Logan Canyon Sweeney, Michael S. creator National Geographic Society (U.S.) text Washington, D.C National Geographic c2007 monographic 189 p. : ill. (chiefly col.), col. maps ; 26 cm. Includes index. 979 NAT 2007 A114 Or. 9781426201011 9781426201028 ((dlx)) http://www.loc.gov/catdir/toc/ecip077/2006036713.html http://www.loc.gov/catdir/toc/ecip077/2006036713.html