The exhibit commenced yesterday and is open daily 10 am to Noon and 1 to 4 pm until the end of September.
It is on display in the Yosemite Museum Gallery, which is on the first floor of the stone and timber building with the ten foot cross section of a sequoia leaning against it, just west of the Valley Visitor Center. The building also houses the Native American exhibits, archives and upstairs, the Research Library.
FYI, the Yosemite Museum has over 1 million items in its collection, a slender fraction of which are on display at any given time. The long range plan is for the current Village Store to be converted into the transportation hub of the valley and become a new visitor center. Most of the historic buildings in the village campus are slated to be converted to use as a series of museums.