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Creation Date 

1. Before 1975  (1)
2. 1975 To 1975  (3)
3. 1976 To 1977  (1)
4. 1978 To 1979  (2)
5. After 1979  (8)
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Subject 

1. Chemistry  (5)
2. Metallurgy  (5)
3. Methods Of Producing Paper Thereon  (3)
4. Regeneration Of Pulping Liquors  (3)
5. Compositions Based Thereon  (3)
6. Apparatus Therefor  (3)
7. General Processes Of Compounding  (3)
8. Organic Macromolecular Compounds  (3)
9. Human Necessities  (3)
10. Production Of Cellulose By Removing Non-Cellulose Substancesfrom Cellulose-Containing Materials  (3)
11. Paper-Making Machines  (3)
12. After-Treatment Not Covered By Subclasses C08b, C08c, C08f,c08g  (3)
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