Refine My Results

Creation Date 

1. Before 1960  (15,404)
2. 1960 To 1975  (37,635)
3. 1976 To 1991  (250,455)
4. 1992 To 2008  (709,320)
5. After 2008  (1,273,625)
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New Records 

1. New From Last Month  (5,620)
2. New From Last 3 Month  (59,918)
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Subject 

1. Electricity  (572,224)
2. Transporting  (319,358)
3. Performing Operations  (319,358)
4. Electrography  (312,782)
5. Photography  (312,782)
6. Cinematography  (312,782)
7. Holography  (312,782)
8. Electric Communication Technique  (305,654)
9. Techniques Or Procedures For The Operation Thereof  (277,791)
10. Frequency-Changing  (277,791)
11. Optical Analogue/digital Converters  (277,791)
12. Non-Linear Optics  (277,791)
13. Optical Logic Elements  (277,791)
14. Metallurgy  (269,269)
15. Chemistry  (269,269)
16. Basic Electric Elements  (242,765)
17. Pictorial Communication, E.G. Television  (242,360)
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Language 

1. English  (1,956,603)
2. Chinese  (435,884)
3. French  (344,895)
4. German  (259,675)
5. Japanese  (174,484)
6. Korean  (114,971)
7. Spanish  (15,417)
8. Russian  (11,396)
9. Portuguese  (8,604)
10. Italian  (5,660)
11. Swedish  (4,601)
12. Dutch  (3,389)
13. Danish  (3,213)
14. Finnish  (2,768)
15. Norwegian  (2,535)
16. Polish  (1,919)
17. Hebrew  (1,154)
18. Czech  (895)
19. Hungarian  (552)
20. Turkish  (445)
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