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Creation Date 

1. Before 1962  (76)
2. 1962 To 1976  (240)
3. 1977 To 1991  (520)
4. 1992 To 2007  (933)
5. After 2007  (2,155)
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Subject 

1. Transporting  (1,076)
2. Performing Operations  (1,076)
3. Methods Of Producing Paper Thereon  (622)
4. Paper-Making Machines  (622)
5. Chemistry  (614)
6. Metallurgy  (614)
7. Apparatus Therefor  (565)
8. Regeneration Of Pulping Liquors  (563)
9. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (563)
10. Human Necessities  (546)
11. Layered Products  (438)
12. Compositions Based Thereon  (367)
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Language 

1. English  (3,381)
2. Chinese  (1,439)
3. French  (391)
4. German  (291)
5. Korean  (113)
6. Japanese  (99)
7. Spanish  (58)
8. Finnish  (56)
9. Swedish  (35)
10. Portuguese  (34)
11. Norwegian  (32)
12. Russian  (25)
13. Danish  (15)
14. Dutch  (14)
15. Italian  (13)
16. Hebrew  (4)
17. Hungarian  (3)
18. Indonesian  (3)
19. Turkish  (3)
20. Czech  (2)
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