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The current GeoRef Thesaurus contains more than 33,900 controlled vocabulary terms and the complete GeoRef indexing structure. The Thesaurus is an indispensable tool for efficient searching of the GeoRef database.
Our last edition offered in print was the 11th edition.

The Introduction to the Thesaurus explains the history and structure of the Thesaurus. In addition, suggestions for searching and indexing are provided for some types of controlled terms.

The classification schemes used in GeoRef are available here.


The print version is out-of-print.

You can also contact GeoRef for assistance in conducting your search at ml@americangeosciences.org