Sue Brannan Walker, a state literary treasure, is associated as closely with Mobile as with Alabama. She has further cemented that legacy with a charming new book for children (and their affiliated adults), Reuben’s Mobile. The book’s conceit is simple but engaging: through a series of page-long poems and accompanying illustrations, the title dog, a (real-life) Harlequin Great Dane, visits a number of key Mobile landmarks. In the process, readers receive thumb-nail introductions to distinguishing features of the city’s history, natural landscape, and cultural traditions.