The series consists of The Maker of Universes (1965), The Gates of Creation (1966), A Private Cosmos (1968), Behind the Walls of Terra (1970), The Lavalite World (1977) and More Than Fire (1993).
Seri ini terdiri dari The Maker of Universes (1965), The Gates of Creation (1966), A Private Cosmos (1968), Behind the Walls of Terra (1970), The Lavalite World (1977), dan More Than Fire (1993).