 Coolbrith's nephew Henry Frank Peterson replaced Coolbrith in 1892, greatly expanding the library's circulation as well as improving accessibility by completing a card catalog system.Charles S. Greene, poet and former editor of the "Overland Monthly", became librarian in 1899 and served until 1926.Mabel W. Thomas, who served as assistant librarian and chief reference librarian under Greene, and retired in 1948, began a collection of books, periodicals, and other material that were the foundation of the California Room in the 1940s and now contained in the well-used Oakland History Room.