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Siege (1969)
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The Jesus Factor (1970)
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Hijacked (1970 – as David Harper)
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A Murder of Crows (1970 – as Patrick Buchanan)
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Farewell, My Slightly Tarnished Hero (1971)
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Big Saturday (1971 – as David Harper)
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A Parliament of Owls (1971 – as Patrick Buchanan)
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Acapulco Gold (1972)
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The Green Air (1973 – as David Harper)
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A Requiem of Sharks (1973 – as Patrick Buchanan)
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Alice and Me (1973 – as William Judson)
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A Sounder of Swine (1974 – as Patrick Buchanan)
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Cold River (1974 – as William Judson)
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Shadows (1975)
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The Patchwork Man (1975 – as David Harper)
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The Hanged Men (1976 – as David Harper)
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Kilman’s Landing (1976 – as William Judson)
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Grizzly (1976 – as Will Collins)
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Sargasso (1977)
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Air Force One (1978)
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The Genesis Rock (1980)
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Long Shots (1981)
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The Drowned Men (1981, unpublished – as David Harper)
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The Glory Wagon (1981, unpublished)