Refine My Results

Creation Date 

1. Before 1959  (87,672)
2. 1959 To 1973  (87,196)
3. 1974 To 1988  (148,326)
4. 1989 To 2004  (244,153)
5. After 2004  (124,417)
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Subject 

1. Transporting  (253,128)
2. Performing Operations  (253,128)
3. Chemistry  (184,320)
4. Metallurgy  (184,320)
5. Physics  (147,400)
6. Technical Subjects Covered By Former Us Classification  (134,532)
7. Electricity  (131,339)
8. Lighting  (125,339)
9. Weapons  (125,339)
10. Blasting  (125,339)
11. Heating  (125,339)
12. Mechanical Engineering  (125,339)
13. Human Necessities  (96,693)
14. Basic Electric Elements  (94,030)
15. Electric Solid State Devices Not Otherwise Provided For  (62,613)
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Language 

1. English  (604,376)
2. French  (101,417)
3. German  (92,537)
4. Korean  (13,360)
5. Chinese  (12,550)
6. Spanish  (7,150)
7. Swedish  (5,086)
8. Dutch  (4,151)
9. Portuguese  (3,834)
10. Japanese  (3,707)
11. Italian  (2,954)
12. Danish  (2,256)
13. Finnish  (2,121)
14. Russian  (1,385)
15. Norwegian  (1,267)
16. Polish  (160)
17. Indonesian  (158)
18. Turkish  (121)
19. Czech  (57)
20. Hungarian  (54)
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