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Creation Date 

1. Before 1978  (104)
2. 1978 To 1980  (135)
3. 1981 To 1983  (121)
4. 1984 To 1987  (191)
5. After 1987  (177)
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Subject 

1. Textiles  (717)
2. Production Of Cellulose  (717)
3. Regeneration Of Pulping Liquors  (717)
4. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (717)
5. Paper-Making  (717)
6. Transporting  (135)
7. Performing Operations  (135)
8. Physical Or Chemical Processes Or Apparatus In General  (130)
9. Chemistry  (123)
10. Metallurgy  (123)
11. Separation  (81)
12. Paper Not Otherwise Provided For  (72)
13. Preparation Thereof Not Covered By Subclasses D21c Or D21d  (72)
14. Impregnating Or Coating Of Paper  (72)
15. Pulp Compositions  (72)
16. Treatment Of Finished Paper Not Covered By Class B31 Or Subclass D21g  (72)
17. Fibrous Raw Materials Or Their Mechanical Treatment  (65)
18. Blasting  (53)
19. Heating  (53)
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Language 

1. English  (482)
2. French  (110)
3. Finnish  (72)
4. German  (71)
5. Swedish  (56)
6. Norwegian  (53)
7. Spanish  (17)
8. Portuguese  (16)
9. Italian  (8)
10. Korean  (7)
11. Russian  (5)
12. Dutch  (4)
13. Danish  (2)
14. Turkish  (1)
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