Read the passage. Bringing Books to People When Mary Lemist Titcomb became the first librarian of Maryland's Washington County Free Library in 1901, she was determined to ensure convenient, widespread access to library materials. To this end, she established dozens of small branch libraries at churches, post offices, and stores. While the plan was successful, Titcomb felt that some residents of isolated rural areas still found it hard to justify a trip to one of those still- distant locations, much less to the main library itself. Some people weren't even aware that the branches existed. Titcomb decided to address this situation by delivering books directly to peoples' homes. To achieve this goal, she designed the first horse-drawn book wagon. The wagon, with space for a variety of books, made its first trip in 1904. The project was so successful that it inspired other libraries to start their own mobile library programs.
What is the main, or central, idea of the passage?