Physics and Astronomy Classification Scheme ((PACS)

The Physics and Astronomy Classification Scheme® (PACS®) is prepared by the American Institute of Physics in collaboration with certain other members of the International Council on Scientific and Technical Information. The most recent internationally agreed scheme was published by ICSTI in 1991. Revised editions of PACS are published biennially, or as necessary, by AIP. The current edition of PACS® is the 2008 edition, offered online in HTML format