Until recently, this incredible book was just one of the Boston Public Library’s 23 million holdings, a book like other books, a workaday entry in a vast and varied catalog. But now, in a culmination of six years of planning, cataloguing, conservation, and fund-raising efforts, the library has given the “Court Booke” its due. Since 2008, under the leadership of library president Amy Ryan, the staff has endeavored to find the library’s most valuable and important materials in order to make them more visible to the general public.