Keys to the Dimensions
1. Land Beyond the Map (1961)
2. The Key to Irunium (1967)
3. The Key to Venudine (1968)
4. The Wizards of Senchuria (1969)
5. The Ships of Durostorum (1970)
6. The Hunters of Jundagai (1971)
7. The Chariots of Ra (1972)
8. The Diamond Contessa (1983)
2. The Key to Irunium (1967)
3. The Key to Venudine (1968)
4. The Wizards of Senchuria (1969)
5. The Ships of Durostorum (1970)
6. The Hunters of Jundagai (1971)
7. The Chariots of Ra (1972)
8. The Diamond Contessa (1983)
