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Creation Date 

1. Before 1961  (40)
2. 1961 To 1975  (205)
3. 1976 To 1990  (4,144)
4. 1991 To 2006  (15,465)
5. After 2006  (25,890)
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New Records 

1. New From Last Week  (32)
2. New From Last Month  (849)
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Subject 

1. Human Necessities  (17,462)
2. Hygiene  (11,334)
3. Medical Or Veterinary Science  (11,334)
4. Lighting  (10,956)
5. Weapons  (10,956)
6. Blasting  (10,956)
7. Heating  (10,956)
8. Mechanical Engineering  (10,956)
9. Transporting  (9,858)
10. Performing Operations  (9,858)
11. Engineering Elements And Units  (9,118)
12. Thermal Insulation In General  (9,118)
13. General Measures For Producing And Maintaining Effectivefunctioning Of Machines Or Installations  (9,118)
14. Electricity  (7,860)
15. Basic Electric Elements  (6,721)
16. Line Connectors  (5,934)
17. Current Collectors  (5,934)
18. Means For Thermal Insulation In General  (5,265)
19. Joints Or Fittings For Pipes  (5,265)
20. Pipes  (5,265)
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Language 

1. English  (42,305)
2. German  (18,503)
3. Japanese  (1,949)
4. Chinese  (762)
5. Korean  (424)
6. Spanish  (318)
7. Portuguese  (89)
8. Russian  (44)
9. Arabic  (15)
10. Romanian  (9)
11. Swedish  (8)
12. Norwegian  (8)
13. Danish  (4)
14. Dutch  (2)
15. Finnish  (1)
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