Thema Subject Categories 1.4

Previous versions of Thema are still available 1.3 1.2 1.1 1.0.

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Notation Category heading Add Mod ?
P Mathematics and Science
Use all P* codes for: mostly academic, technical and specialist titles and some general adult works. Qualifiers are mostly not required with P* codes. DO NOT USE: code ‘P’ itself, but select specific categories from section P*.
Prefer: WN* codes for general interest adult titles where appropriate
1.4
PS Biology, life sciences
Use all PS* codes for: academic, specialist and professional level works.
Prefer: WN* codes for natural history etc for the general reader.
See also: WN* Nature and the natural world: general interest and its subcategories
PSP Hydrobiology
See also: RBK Hydrology and the hydrosphere
PSPF Freshwater biology
See also: RBKF Limnology (inland waters)

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