Jeff Mitton
John Muir, one of America's most treasured naturalists and proponent of conservation, visited Yosemite Valley in 1868 and was smitten by its grandeur.聽
<p>Boulder鈥檚 public open-space system was launched 50 years ago, and an event at 欧美口爆视频-Boulder will bring together experts who will discuss the lay of the land in the next half-century.</p>