The recent revision of the AGU index set
Bruce Tsatnam Tsurutani, Jurate M. Landwehr · Eos · 1985
Index terms are those keywords attached to journal articles and geophysical abstracts in press (GAP) that facilitate their categorization and consequently allow for rapid searches of the published literature by topical areas. AGU published an index set in 1973 that became a standard in the geophysical sciences in that other organizations also incorporated this set into their index schemes.