The codes below display in the CL: Classification field.

1 Extractive Metallurgy
2 Melting and Casting
3 Fabrication
4 Surface Treatment
5 Joining
6 Powder Metallurgy
7 Physical Metallurgy
8 Properties
9 Corrosion and Oxidation
10 Composites
11 Copper Compounds
12 Superconductivity
13 Competitive Materials
14 Applications
15 Insulation
16 Pollution Control
17 Energy
18 Other