Browsing by Keyword (DDC)

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     150 Psychology [14]
     330 Economics [1]
     380 Commerce, communications and transportation [1]
500 Science [5]
     510 Mathematics [2]
     530 Physics [21]
     540 Chemistry [7]
     570 Life sciences; biology [26]
     580 Plants; biology [6]
     590 Animals; zoology [1]
     620 Engineering [11]
     630 Agriculture [50]
         796 Athletic and outdoor sports and games [3]