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)
