Refine My Results

Creation Date 

1. Before 1961  (72)
2. 1961 To 1975  (568)
3. 1976 To 1990  (18,352)
4. 1991 To 2006  (108,842)
5. After 2006  (400,697)
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New Records 

1. New From Last Month  (9,524)
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Subject 

1. Physics  (199,787)
2. Electricity  (158,887)
3. Transporting  (123,869)
4. Performing Operations  (123,869)
5. Lighting  (69,359)
6. Weapons  (69,359)
7. Blasting  (69,359)
8. Heating  (69,359)
9. Mechanical Engineering  (69,359)
10. Conversion Or Distribution Of Electric Power  (56,792)
11. Generation  (56,792)
12. Electric Communication Technique  (54,162)
13. Calculating  (49,154)
14. Computing  (49,154)
15. Counting  (49,154)
16. Measuring  (48,456)
17. Testing  (48,456)
18. Metallurgy  (46,366)
19. Chemistry  (46,366)
20. Human Necessities  (42,757)
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Language 

1. English  (500,409)
2. Chinese  (233,938)
3. French  (32,650)
4. Korean  (26,808)
5. German  (20,480)
6. Japanese  (17,436)
7. Russian  (3,058)
8. Spanish  (2,226)
9. Portuguese  (1,176)
10. Italian  (558)
11. Swedish  (200)
12. Danish  (199)
13. Finnish  (169)
14. Norwegian  (159)
15. Polish  (131)
16. Ukrainian  (118)
17. Dutch  (83)
18. Bulgarian  (66)
19. Hebrew  (57)
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