The Michigan Lighthouse Conservancy website includes an extensive compilation of the tools required for the operation of a lighthouse. In addition to the expected hardware and lights, they document some beautifully crafted "traveling libraries."
In 1876 portable libraries were first introduced in the Light-House Establishment and furnished to all light vessels and inaccessible offshore light stations with a selection of reading materials. These libraries were contained in a portable wooden case, each with a printed listing of the contents posted inside the door. Proper arrangements were made for the exchange of these libraries at intervals, and for revision of the contents as books became obsolete in accordance with suggestions obtained from public library authorities.
At the link is a sample list and thumbnail description of some of the books that were included in these libraries.