| 
   
[Updated: 2016-Sep-29] 
  
    
      
        
          | 400 | 
          Natural sciences | 
         
        
          | 401 | 
          Theory and philosophy | 
         
        
          | 402 | 
          History and conditions | 
         
        
          | 403 | 
          Reference books | 
         
        
          | 404 | 
          Essays and lectures | 
         
        
          | 405 | 
          Serial publications | 
         
        
          | 406 | 
          Organizations | 
         
        
          | 407 | 
          Study and teaching | 
         
        
          | 408 | 
          Collected works. Collections | 
         
        
          | 409 | 
          Science and technology policy | 
         
       
     | 
    
      
        
          | 410 | 
          Mathematics | 
         
        
          | 411 | 
          Algebra | 
         
        
          | 412 | 
          Theory of numbers | 
         
        
          | 413 | 
          Analysis | 
         
        
          | 414 | 
          Geometry | 
         
        
          | 415 | 
          Topological mathematics | 
         
        
          | 416 | 
           | 
         
        
          | 417 | 
          Probabilities. Mathematical statistics | 
         
        
          | 418 | 
          Numerical calculations | 
         
        
          | 419 | 
          Mathematics of Japan and China | 
         
       
     | 
   
  
    
      
        
          | 420 | 
          Physics | 
         
        
          | 421 | 
          Theoretical physics | 
         
        
          | 422 | 
           | 
         
        
          | 423 | 
          Mechanics | 
         
        
          | 424 | 
          Vibrations. Acoustics | 
         
        
          | 425 | 
          Optics | 
         
        
          | 426 | 
          Heat. Thermotics | 
         
        
          | 427 | 
          Electricity and magnetism | 
         
        
          | 428 | 
          Physical properties of matter | 
         
        
          | 429 | 
          Atomic and nuclear physics | 
         
       
     | 
    
      
        
          | 430 | 
          Chemistry | 
         
        
          | 431 | 
          Physical and theoretical chemistry | 
         
        
          | 432 | 
          Experimental chemistry | 
         
        
          | 433 | 
          Analytical chemistry | 
         
        
          | 434 | 
          Synthetical chemistry | 
         
        
          | 435 | 
          Inorganic chemistry | 
         
        
          | 436 | 
           Metallic elements, their compounds | 
         
        
          | 437 | 
          Organic chemistry | 
         
        
          | 438 | 
           Chemistry of cyclic compounds | 
         
        
          | 439 | 
           Chemistry of natural products | 
         
       
     | 
   
  
    
      
        
          | 440 | 
          Astronomy. Space sciences | 
         
        
          | 441 | 
          Theoretical astronomy | 
         
        
          | 442 | 
          Practical astronomy | 
         
        
          | 443 | 
          Fixed stars | 
         
        
          | 444 | 
          Sun | 
         
        
          | 445 | 
          Planets. Satellites | 
         
        
          | 446 | 
          Moon | 
         
        
          | 447 | 
          Comets. Meteors | 
         
        
          | 448 | 
          Earth. Astronomical geography | 
         
        
          | 449 | 
          Horology. Calendars | 
         
       
     | 
    
      
        
          | 450 | 
          Earth sciences | 
         
        
          | 451 | 
          Meteorology | 
         
        
          | 452 | 
          Oceanography | 
         
        
          | 453 | 
          Seismology | 
         
        
          | 454 | 
          Geomorphology | 
         
        
          | 455 | 
          Geology | 
         
        
          | 456 | 
          Historical geology. Stratigraphy | 
         
        
          | 457 | 
          Paleontology | 
         
        
          | 458 | 
          Petrology | 
         
        
          | 459 | 
          Mineralogy | 
         
       
     | 
   
  
    
      
        
          | 460 | 
          Biology | 
         
        
          | 461 | 
          Theoretical biology | 
         
        
          | 462 | 
          Biogeography | 
         
        
          | 463 | 
          Cytology | 
         
        
          | 464 | 
          Biochemistry | 
         
        
          | 465 | 
          Microbes. Microbiology | 
         
        
          | 466 | 
           | 
         
        
          | 467 | 
          Genetics. Evolution | 
         
        
          | 468 | 
          General ecology | 
         
        
          | 469 | 
          Anthropology | 
         
            | 
    
      
        
          | 470 | 
          Botany | 
         
        
          | 471 | 
          General botany | 
         
        
          | 472 | 
          Phytogeography. Flora | 
         
        
          | 473 | 
          Thallophyta | 
         
        
          | 474 | 
           Algae and fungi | 
         
        
          | 475 | 
           Bryophyta | 
         
        
          | 476 | 
           Pteridophyta | 
         
        
          | 477 | 
          Spermatophyta | 
         
        
          | 478 | 
           Gymnospermae | 
         
        
          | 479 | 
           Angiospermae | 
         
       
     | 
   
  
    
      
        
          | 480 | 
          Zoology | 
         
        
          | 481 | 
          General zoology | 
         
        
          | 482 | 
          Zoogeography. Fauna | 
         
        
          | 483 | 
          Invertebrata | 
         
        
          | 484 | 
           Mollusca | 
         
        
          | 485 | 
           Arthropoda | 
         
        
          | 486 | 
           Insecta. Entomology | 
         
        
          | 487 | 
          Vertebrata | 
         
        
          | 488 | 
           Aves. Ornithology | 
         
        
          | 489 | 
           Mammalia | 
         
       
     | 
    
      
        
          | 490 | 
          Medical sciences | 
         
        
          | 491 | 
          Fundamental medicine | 
         
        
          | 492 | 
          Clinical medicine | 
         
        
          | 493 | 
          Internal medicine | 
         
        
          | 494 | 
          Surgery | 
         
        
          | 495 | 
          Gynecology. Obstetrics | 
         
        
          | 496 | 
          Ophthalmology. Otorhinolaryngology | 
         
        
          | 497 | 
          Dentistry | 
         
        
          | 498 | 
          Hygienics. Public health. Preventive medicine | 
         
        
          | 499 | 
          Pharmaceutics | 
         
       
     | 
   
 
  
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