The Ugly Swans. Macmillan, 1979.

The Ugly Swans. Macmillan, 1979.

The Time Machine. Berkley G445, 1960.

The Time Machine. Berkley G445, 1960.

The Spacejacks. Berkley N2847, 1975.

The Spacejacks. Berkley N2847, 1975.

Seeker from the Stars. Berkley X1438, 1967.

Seeker from the Stars. Berkley X1438, 1967.

Cycle of Fire. Ballantine 70007, 1969.

Cycle of Fire. Ballantine 70007, 1969.

The Far Country. Dell D175, 1955.

The Far Country. Dell D175, 1955.

City. Doubleday 264, 1953.

City. Doubleday 264, 1953.

August Heat. Cavalier, 1961.

August Heat. Cavalier, 1961.

Sometime, Never. Ballantine 215, 1957.

Sometime, Never. Ballantine 215, 1957.

His Share of Glory. NESFA Press, 1997.

His Share of Glory. NESFA Press, 1997.

Voyager in Night. Daw, 1984.

Voyager in Night. Daw, 1984.

The Worlds of Clifford Simak.Avon G-1096, 1960.

The Worlds of Clifford Simak.Avon G-1096, 1960.

Dogsled Danger. Random House, 1956.

Dogsled Danger. Random House, 1956.