| 208 / | HD | MINERAL OILS: PROCESSES AND PRODUCTS |
| 46 | DF | CHEMICAL CONVERSION OF HYDROCARBONS {11} |
| 49 | DF | .~ Plural serial stages of chemical conversion {6} |
| 62 | DF | .~.~ First stage is reforming {2} |
| 63 | | .~.~.~ Reforming in all stages {1} |
| 64 | DF | .~.~.~.~> Catalyst in at least one stage {1} |