Ace Books | Sector General

Combat SF

Combat SF cover

Gordon R. Dickson

1981

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The Escape Orbit, Ace, 1964

Open Prison, Four Square, 1965 cover

October 1964

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The Escape Orbit, Ace, 1983

The Escape Orbit, Ace, 1983 cover

April 1983

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The Secret Visitors, Ace, 1967

The Secret Visitors, Ace, 1967 cover

December 1967

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The Secret Visitors, Ace, 1957

The Secret Visitors cover

August 1957

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Second Ending, Ace, 1963

Second Ending, Ace, 1963 cover

January 1963

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