6. Congresses. Industrial museums, etc. see T179+. International exhibitions see T391+. 7. Collected works (nonserial). 8. Symbols and abbreviations. Dictionaries and encyclopedias. 9. General works. 10. Bilingual and polyglot. Communication of techn
Geology General Including geographical divisions Mineralogy Petrology Dynamic and structural geology Volcanoes and earthquakes Structural geology Stratigraphy Paleontology Paleozoology Paleobotany
Natural history (General) General Including nature conservation, geographical distribution Microscopy Biology (General) Evolution Genetics Reproduction Life Ecology Cytology Economic biology
Zoology General Including geographical distribution Invertebrates Insects Chordates. Vertebrates Fishes Reptiles and amphibians Birds Mammals Animal behavior Stories and anecdotes Morphology Anatomy Embryology