1. DESCRIPTION OF THE DATA FIELD:

Variable length

Essential filling Repetitive

2. DATA ELEMENT DEFINITION:

Pre-coded DeCS/MeSH descriptors used to represent the research subjects and historical periods studied.

3. NOTES:

a) One or more pre-coded descriptors are selected from the index.

b) DeCS/MeSH should be consulted, and guidelines from the Indexing Manual should be followed.

4. EXAMPLES:

a) Human Female

b) Preschool

c) Child

d) Animals

e) History of the 20th Century