TABLE A : SUBDIVISIONS OF -5 



547 Organic Chemistry. 



[See also 62 : 54 Agricultural Chemistry and '66 Chemical 



Technology.] 



548 Crystallography. 

 549 Mineralogy. 

 55 Geology. 

 55(2-9) Eegional geology 



[divided as in Table Cj. 



551 Physical geology. 



5511 General structure of globe. 



5512 Internal action. 



5513 External action. 



55131 Glaciation. 



55135 Deposition and erosion. 



5514 Physical Geography. 



'55 1 5 Meteorology. 



'55 1 7 Stratigraphical geology. 



55171 Archean, Azoic [etc. as in Table C (u)]. 



5518 Structural geology. 



5519 Agents of geological work. 



552 Lithology, Petrography. 



5521 Igneous rocks. 



5522 Volcanic. 



5523 Plutonic. 



'5524 Metamorpbic. 



5525 Aqueous. 



.5526 . Meteorites. 



5528 Microscopical petrography. 



553 Economic geology. 



5531 Ore deposits. 



'553 2 Carbon minerals. 



5533 Iron ores. 



'5534 Ores of other metals. 



5535 Building stones. 



5536 Karths. 



'5538 Gems. 



17 2 



