P Language and Literature Philology and Linguistics PA Classical philology 1-199 General 201-891 Greek languages 1001-1151 Mediæval and modern 2001-2899 Latin language PB Modern European languages. General works Celtic language Romance languages Teutonic languages General Gothic Scandinavian PE English PF Frisian Dutch German PG Slavic languages Lithuanian Lettish PH Finnish Hungarian Albanian Basque PJ Oriental languages. General works Hamitic Semitic PK Indo-Iranian Armenian Caucasian PL Languages of Eastern Asia, Oceania, Africa PM Hyperborean languages American languages PN-PV Literary History. Literature PZ Fiction Q Science. General QA Mathematics 801-999 Analytic mechanics QB Astronomy 281-349 Geodesy QC Physics 81-119 Weights and measures 801-999 Terrestrial magnetism and meteorology QD Chemistry 901-999 Crystallography QE Geology _cf._ BG, GC 351-499 Mineralogy and petrology 701-999 Palæontology QH Natural history 201-299 Microscopy 301-999 General biology QK Botany QL Zoology 801-999 General anatomy and embryology QM Human anatomy QP Physiology QR Bacteriology R Medicine. General RA State medicine. Documents Public health Medical climatology. Hospitals Jurisprudence RB Pathology RC Practice of medicine RD Surgery RE Ophthalmology RF Otology. Phrenology. Laryngology RG Gynecology and obstetrics RJ Pediatrics RK Dentistry RL Dermatology RM Therapeutics RS Pharmacy and materia medica RT Nursing RV Botanic, Thomsonian and Eclectic medicine RZ Miscellaneous schools and arts S Agriculture. Plant and Animal Industry General agriculture, soils, fertilizers, farm implements, etc. SB General plant culture, including field crops. Horticulture. Landscape gardening and parks. Pests and diseases SD Forestry SF Animal husbandry. Veterinary medicine Fish culture and fisheries. Angling SK Hunting. Game protection