Ulrich's international periodicals directory / R. R. Bowker Company - 12th ed. - New York: R. R. Bowker Company, 1968 - lxii, 1755p. Vol.2 (Arts, humanities, business & social sciences) Subjects--Topical Terms: Science Subjects--Index Terms: Directory Universal Decimal Class. No.: R 05(058.7) / K7.1