Universal Decimal Classification - London: British Standards Institution, 1943 - 123p. Part 3. (55 Geology, Geophysics 56 Palaeontology 57 Biology 58 Botany 59 Zoology) Vol. 2 Subjects--Topical Terms: Library science Subjects--Index Terms: Classification Nature Universal Decimal Class. No.: D 025.45 / H3.3