Thema Subject Categories 1.3

Previous versions of Thema are still available 1.2 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 for: (all RB* codes) academic, specialist and professional level works. Prefer WN* codes for the general reader. See also: RGB* Physical geography & topography and its subcategories, WN* Nature & the natural world: general interest and its subcategories
RG Geography
Use with: (all RG* codes,) PLACE Qualifiers 1* as appropriate
RN The environment
RP Regional & area planning

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