American drug index. [electronic resource] . — 34th ed. / Norman F. Billups ; associate editor, Shirley M. Billups.. — Philadelphia : : Lippincott,, c1989.. — ix, 753 p. ; 21 cm. ISBN: 0932686273 9780932686275 LCCN: 55006286 Subjects--Topical Terms: Pharmaceutical Preparations--Catalogs.Pharmaceutical Preparations--Indexes.Drugs--Dictionaries. Dewey Class. No.: 615