I coveted Georgia O’keeffe And Ansel Adams: Natural Affinities (Little, Brown, $40) from the first moment I saw it.  Quite simply, it’s a beautiful book.  Georgia O’Keeffe and Ansel Adams have never been paired together in a book, but it’s an affiliation that works on many levels.  Both were inspired by the dramatic natural surroundings of the American West.  Their work, while different in style, shares a similar approach to light, texture, and composition.   The juxtaposition of O’Keeffe’s simple lines and soft colors with Adams’s black-and-white photographs deepens a viewer’s appreciation of each.   The accompanying essays illuminate the artists’ lives, inspiration, and lifelong friendship. (Don’t miss the exhibit of these artists’ work at the American Art Museum, on display through January 4.)