Ulrich's international periodicals directory 1991-92: Including irregular serials & annuals / R R Bowker Company - 30th ed. - New York: R R Bowker Company, 1991 - 1058p. - A bowker serials bibliography . Vol.1 (A-G)Vol.2 (H-Z)Vol.3 (Indexes) Subjects--Topical Terms: Information science Subjects--Index Terms: Periodicals Universal Decimal Class. No.: R 05(058.7) / N1.1