Burkett, J Directory of scientific directories: A world guide to scientific directories including medicine, agriculture, engineering, manufacturing and industrial directories - 3rd ed. - Harlow: Francis Hodgson, 1979 - 649p. ISBN: 0-582-90150-2 Subjects--Topical Terms: Bibliographies Subjects--Index Terms: Scientific Universal Decimal Class. No.: R 016:5:058.7 / L9