Thema Subject Categories 1.2

Previous versions of Thema are still available 1.1 1.0.

Browse the Thema subject categories hierarchy, or search for a specific term within the hierarchy.

See the search hints below.

Notation Category heading Add Mod ?
R Earth Sciences, Geography, Environment, Planning
RB Earth sciences
Use RB* codes for academic, specialist and professional level works; prefer WN* codes for natural history etc for the general reader. See also: RGB* Physical geography & topography and its subcategories
RG Geography
With RG* codes, assign also PLACE Qualifiers as appropriate
RN The environment
RP Regional & area planning

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