Bay seniors with a preference for looking backwards are invited to check out the new historical survey “Yosemite: A Storied Landscape” at the California Historical Society on Mission Street downtown. You, of course, know that this is the 150th anniversary of President Lincoln dedicating Yosemite as arguably the first national park. The exhibit includes a rich trove of artifacts, paintings and photographs. The opening day is this Sunday and it’s free. If you have an appetite for more local history pick up Ben Tarnoff’s “ Bohemians: Mark Twain and the San Francisco Writers who Reinvented America.” It covers one of our few claims to real regional literature, concentrating on writers from the 1860’s to the early 20th century like Bret Harte and Ina Coolbrith.