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Classification
Books
130
Classification, Universal decimal
43
Subject headings
20
Botany
19
Congresses
17
Soils
16
Occupations
12
Bibliography
11
Biology
10
Plants
10
Folklore
9
Cataloging
7
Information storage and retrieval systems
7
Land use
7
Research
7
Abstracting and indexing
6
Building
6
Commercial products
6
Indexing
6
Insects
6
Zoology
6
Fishes
5
Geology
5
History
5
Mental illness
5
Nomenclature
5
Statistics
5
Bacteriology
4
Birds
4
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