MARC Tags by Hundreds

The basic divisions of the MARC 21 bibliographic are:

In discussions of MARC 21 tags, the notation XX is often used to refer to a group of related tags. For example, 1XX refers to all of the tags in the 100s: 100, 110, 130, and so on.

0XX	Control information, numbers, codes
1XX	Main Entry (e.g. Author, etc.)
2XX	Titles, etc.
3XX	Physical description, etc.
4XX	Series statements
5XX	Notes
6XX	Subject added entries
7XX	Added entries
8XX	Series added entries
9XX	Locally defined uses (NOTE: all Evergreen records have a 901 tag. Do not delete this tag.)

For more information on MARC Tags, and how to catalog to them see: OCLC Bibliographic Formats and Standards