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Creation Date 

1. Before 1960  (257)
2. 1960 To 1975  (268)
3. 1976 To 1991  (727)
4. 1992 To 2008  (989)
5. After 2008  (599)
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Subject 

1. Textiles  (2,817)
2. Production Of Cellulose  (2,817)
3. Paper-Making  (2,817)
4. Regeneration Of Pulping Liquors  (2,815)
5. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (2,815)
6. Chemistry  (610)
7. Metallurgy  (610)
8. Paper Not Otherwise Provided For  (565)
9. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (565)
10. Impregnating Or Coating Of Paper  (565)
11. Pulp Compositions  (565)
12. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (565)
13. Fibrous Raw Materials Or Their Mechanical Treatment  (262)
14. Transporting  (255)
15. Performing Operations  (255)
16. Microbiology  (212)
17. Biochemistry  (212)
18. Beer  (212)
19. Enzymology  (212)
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Language 

1. English  (2,254)
2. French  (519)
3. German  (316)
4. Chinese  (315)
5. Finnish  (144)
6. Swedish  (119)
7. Norwegian  (92)
8. Spanish  (64)
9. Portuguese  (59)
10. Korean  (39)
11. Russian  (31)
12. Japanese  (15)
13. Italian  (9)
14. Danish  (9)
15. Indonesian  (5)
16. Dutch  (5)
17. Icelandic  (2)
18. Czech  (1)
19. Latvian  (1)
20. Turkish  (1)
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