The volume comprises an updated and critical description of the binary and ternary thorium carbides. These compounds are of technological interest because of their possible use as fertile materials in advanced nuclear power reactors. The fuel for the Thermal Breeder consists of a ThC-UC solid solution and that for the Thorium High Temperature Reactor of coated ThC2-UC2 particles. The binary Th-C system and ternary carbides were intensively investigated...