The Horseback Librarians by Jane Yolen
Anna Mary brings books to children and adults in Appalachia during the Great Depression.
There were no libraries in the backwoods of Kentucky in the 1930s. Librarians there and throughout the South delivered books to families by horseback and mule, sleeping outdoors or sheltering in barns when they could, going from farm to farm in remote areas. In this story, a woman named Anna Mary stands in for all the real-life horseback librarians who helped keep the love of books alive in Appalachia during the Great Depression.-Goodreads