An annual documentary, historical, or memorial compendium of facts, photographs, statistics, etc., about the events of the preceding year, often limited to a specific country, institution, discipline, or subject (example: Supreme Court Yearbook published by Congressional Quarterly). Optional yearbooks are offered by some publishers of general encyclopedias. Most libraries place yearbooks on continuation order and shelve them in the reference collection. Yearbooks of historical significance may be stored in archives or special collections. Also spelled year book. Compare with annual. Also refers to an annual high school or college publication commemorating a particular school year or graduating class in photographs, usually sold in hardcover to seniors by advance special order at the end of the school year. Some libraries archive yearbooks for their school or for schools in their geographic area (see this example).