Cataloging: Fundamentals of the NLM® Classification
Module 2—Using the Online NLM Classification
page 7 of 16
Introduction
Module 1
Overview of NLM Classification
Module 2
Using the Online NLM Classification
Module 3
Components of NLM Call Numbers
Module 4
General Principles
Module 5
Table G
Module 6
Form Numbers
Module 7
Bibliographies and Related Materials
Module 8
Classification of 19th Century Works and Early Printed Books
Module 9
Continuing Resources
Class Number Format
- Spaces—Unlike LCC, there is a space between the letter(s) and the number(s). Exception: Even though W1–W9 are displayed online with a space in between, do not input a space when recording these numbers in a bibliographic record.
Examples:
QS 16 not QS16
but
W2 not W 2
- Decimals—May or may not indicate subordinate class numbers
Example of subordinate decimal class number
Example of decimal class number that is not subordinate
- Indentation—Indented schedule captions always indicate class numbers for subordinate concepts
Example: Class numbers WB 146 through WB 182 are subordinate to WB 143
