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John Muir, one of America's most treasured naturalists and proponent of conservation, visited Yosemite Valley in 1868 and was smitten by its grandeur. 

<p>Boulder’s public open-space system was launched 50 years ago, and an event at ¶¶ÒõÂÃÐÐÉä-Boulder will bring together experts who will discuss the lay of the land in the next half-century.</p>