The further division of the main subject groups is made by number groups of hundreds. Each such „hundred group“ is further divided by the numbers 1-99. This is made for every subject group and subgroup (except HA General medicine).
Below you see the meaning of the numbers 1-50. The numbers 51-99 are used variously within the groups to differentiate them.
Comment
| Number division | Subdivision | ||||||
|---|---|---|---|---|---|---|---|
| 1 | Manuals, handbooks | ||||||
| 2 | Textbooks | ||||||
| 3 | Brief descriptions | guides, compendia, revision books, programmed instructions | |||||
| 4 | Textbooks for specific professions | ||||||
| 5 | Congresses, conference proceedings, advanced training courses | ||||||
| 6 | Travels, expeditions | ||||||
| 7 | Atlases, illustration works, maps | ||||||
| 8 | Legislation | ||||||
| 10 | Innovation, development, research | ||||||
| 11 | Prizes and awards | ||||||
| 12 | Apprenticeship, training, examination questions | ||||||
| 13 | Schools and courses | ||||||
| 15 | Directories of institutions, address books | ||||||
| 16 | Individual institutions | ||||||
| 17 | Associations, foundations, companies | ||||||
| 18 | Exhibitions | ||||||
| 19 | Commemorative writings | ||||||
| 20 | History | ||||||
| 21 | History of individual periods | ||||||
| 22 | Regional history | ||||||
| 24 | Biographical reference works | individual personalities from medicine and natural sciences see HG | |||||
| 25 | Basics, philosophical questions | ||||||
| 26 | Political and social aspects | ||||||
| 28 | Significance and relation to other disciplines | ||||||
| 30 | Working methods | use of computers | |||||
| 31 | Mathematical and statistical methods | ||||||
| 32 | Instruments | ||||||
| 35 | Table works | ||||||
| 38 | Language dictionaries | language textbooks see AA | |||||
| 40 | Alphabetical encyclopaedias, terminology | ||||||
| 45 | Bibliography, documentation | ||||||
| 46 | Journals and series | ||||||
| 48 | Popular descriptions, poetic adaptions | practical advice for laymen, patient reports | |||||
| 49 | General information about the entire field | ||||||
| 50 | Miscellaneous | ||||||