Refine My Results

Creation Date 

1. Before 1960  (1,231)
2. 1960 To 1975  (1,936)
3. 1976 To 1991  (13,512)
4. 1992 To 2008  (36,922)
5. After 2008  (73,595)
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New Records 

1. New From Last Month  (3,144)
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Subject 

1. Physics  (73,034)
2. Electricity  (32,063)
3. Optics  (30,294)
4. Measuring  (28,458)
5. Testing  (28,458)
6. Optical Elements, Systems, Or Apparatus  (26,014)
7. Human Necessities  (21,912)
8. Basic Electric Elements  (20,510)
9. Transporting  (17,057)
10. Performing Operations  (17,057)
11. Hygiene  (16,157)
12. Medical Or Veterinary Science  (16,157)
13. Lighting  (13,432)
14. Weapons  (13,432)
15. Blasting  (13,432)
16. Heating  (13,432)
17. Mechanical Engineering  (13,432)
18. Semiconductor Devices  (12,564)
19. Electric Solid State Devices Not Otherwise Provided For  (12,564)
20. Investigating Or Analysing Materials By Determining Theirchemical Or Physical Properties  (12,466)
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Language 

1. English  (110,722)
2. French  (29,115)
3. Chinese  (26,923)
4. German  (14,156)
5. Japanese  (9,831)
6. Korean  (4,380)
7. Spanish  (1,919)
8. Russian  (1,028)
9. Portuguese  (685)
10. Italian  (397)
11. Danish  (265)
12. Hebrew  (232)
13. Swedish  (200)
14. Norwegian  (198)
15. Dutch  (144)
16. Polish  (134)
17. Finnish  (127)
18. Ukrainian  (85)
19. Czech  (81)
20. Romanian  (59)
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