| 208 / | HD | MINERAL OILS: PROCESSES AND PRODUCTS |
| 46 | DF | CHEMICAL CONVERSION OF HYDROCARBONS {11} |
| 49 | DF | .~ Plural serial stages of chemical conversion {6} |
| 67 | DF | .~.~ First stage is thermal or catalytic cracking {4} |
| 71 | | .~.~.~ With subsequent polymerization |