252 / | HD | COMPOSITIONS |
625 | DF | RADIOACTIVE COMPOSITIONS {4} |
636 | .~ Nuclear reactor fuel {4} | |
637 | DF | .~.~> Actinide having nonactinide component {3} |
641 | DF | .~.~> Actinide nitrides only |
642 | DF | .~.~> Actinide carbides only |
643 | DF | .~.~> Actinide oxides only |