NLM® Classification Fundamentals

Classification (Class) Numbers


Special Class Number Types


Form Numbers

There is a special set of classification numbers called form numbers.

Generally ranging from 1 through 49, form numbers are a group of numbers in each schedule that are used to classify materials by publication type (e.g., dictionaries, atlases) or topical subheading/special topic (e.g., history or legislation). Some numbers in the range of 1 through 49 reflect format and content types, others are for material with a special topical emphasis.

Example

The following are examples of special topics:

  • 18 is for education
  • 21 is for the profession or specialty
  • 33 is for discussion of law

Common Form Numbers
Common Form Numbers (not a comprehensive list)
Form Number Publication Type or Specific Aspects
1 Organizations, Societies
5–7 Collected Works
11 History
13 Abbreviations, Dictionary, Encyclopedia
15 Classification, Phrases, Terminology
16 Statistics, Tables, Surveys
17 Atlas, Pictorial Work
18 Education
18.2 Examination Questions, Problems and Exercises, Outline, Programmed Instruction
22–22.1 Directory
25 Laboratory Manual
32–33.1 Legislation
39/49 Handbook

Some main schedules are divided into sections using form numbers in each section (e.g., QV 701–735). Note that this is not always the case (e.g., QV 601 is for "Antidotes and other therapeutic measures" and not "Organizations. Societies.")

Example

Within the QV schedule for Pharmacy and Pharmaceutics, similar form numbers are used for QV 1–39 as QV 701–735.


Examples of Form Numbers
Class Number Caption Class Number Caption
QV
Pharmacology
Reference Works. General Works
QV
Pharmacology
General Pharmacy and Pharmaceutics
QV 1 Organizations. Societies (General or not elsewhere classified) QV 701 Organizations. Societies (General or not elsewhere classified)
QV 4 General works QV 704 General works
QV 5 Collected works by several authors QV 705 Collected works by several authors
QV 7 Collected works by individual authors QV 707 Collected works by individual authors
QV 9 Addresses. Essays. Lectures QV 709 Addresses. Essays. Lectures
QV 11 History QV 711 History
QV 11.1      General coverage (Not Table-G) QV 711.1      General coverage (Not Table-G)