Includes more than 3.7 million references to books (250,000 items), dissertations (300,000 items), analytics [e.g., journal articles, newspaper articles, obituaries, and letters] (2.5 million items) and portraits (4,400 items) found in the 61 volume set of the same name. The Library of the Surgeon General's Office was the precursor to today's National Library of Medicine. Even though the series began publication in 1880, older items can be found here as well. [more]