KEY TO CLASSIFICATION. 



Agriculture, S. 



Anatomy, QM. 



Anthropology, GN. 



Artificial (Imitation) Substances, TP 995. 



Astronomy, QB. 



Bacteriology, QR. 

 Bibliography, National, AC. 



— Universal, AA-AB. 



Book Selection Technology, T. 

 Brewing, TP 570. 



Ceramics, TP 785. 

 Chemical Technology, TP. 

 Chemistry, QD. 



— Analytical, QD 70. 



— Physical, QD 450. 

 Coal Mining, TN 802. 



Economics, HB. 

 Education, L. 



Electrical Engineering, TK. 

 Engineering, TA. 

 Entomology, QL. 

 Eugenics, HQ. 



Factory Organisation, TA. 



Gas Manufacture, TP 700. 

 Geography, G. 

 Geology, QE. 

 Glass Making, TP 845. 



Indexes [to Periodicals], AI. 

 Iron and Steel, TS 300. 



Labour, HD 

 Law, K. 



Legislation, KZ. 



Leather Manufacture, TS 940. 



Lighting, Artificial, TP 700. 



Medicine, R. 

 Metallography, TN 690. 

 Metallurgy, TN 600. 



— Iron, TS 300. 

 Microscopy, QH 201. 

 Military Science, U. 

 Mineral Industries, TN. 

 Municipal Administration, HD. 



Papermaking, TS 1080. 

 Pathology, Plant, SB 509. 

 Periodicals, Indexes, AI. 



— Union Lists, AA. 

 Philosophical Instruments, Q 184. 

 Photography, TR. 



Physical Chemistry, QD 450. 

 Physics, QC. 

 Physiology, Animal, QP. 

 Plant Pathology, SB 509. 

 Press Directories, AC 50. 

 Public Documents, AD. 



Radioactivity, QC 47.5. 

 Radiotelegraphy, TK 570. 



Science, Q. 



Scientific Instruments, Q 184. 



— Management, TA. 



Technology, T. 

 Textiles, TS 1300. 



Waste Utilization, TP 995. 

 Wireless Telegraphy, TK 570. 



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