The gift of reading in San Francisco comes with a bonus this holiday season. Donations to the Children’s Book Project, a nonprofit that puts donated books into the hands of disadvantaged children throughout The City, will be matched by an anonymous donor up to $50,000 until Jan. 1, the organization announced. The Children’s Book Project reopened Aug. 2 in Room 105 of the Francis Scott Key annex at 1360 43rd Ave. in the Sunset, after spending 22 years in the Bayview. The site is open for book distribution Mondays and Thursdays from 3:30 to 6 p.m., Wednesdays from 10 a.m. to noon, and the first Saturday of each month from 10 a.m. to 1 p.m. More than 100,000 books annually are given through the project to teachers, librarians, health care professionals and facilities that serve children. Many are sent to child care centers, homeless shelters and schools, according to the project. Some books are given directly to children, many of whom have never owned a book.