First prescribed burn occurs in Mariposa Grove of Big Trees. Yosemite is named to the World Heritage List. In an attempt by scientists to reestablish a viable population, a herd of California bighorn sheep are reintroduced into Yosemite near Lee Vining Canyon. Thus far, the experiment has proved successful. Yosemite celebrates its centennial as a national park.
Forest fires consume thousands of park acres.
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