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The Oppenheim Omnibus: Clowns and Criminals 1931: Boston, Little Brown 1931: New York, Blue Ribbon 1931: Toronto, McClelland & Stewart |
- Michael's Evil Deeds
- Peter Ruff and the Double Four
- Recalled by the Double Four
- Jennerton & Co.
- Aaron Rodd, Diviner [not included in the Blue Ribbon Books edition]
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Shudders and Thrills: The Second Oppenheim
Omnibus 1932 (July): Boston, Little Brown 1932: New York, Blue Ribbon |
- The Evil Shepherd
- Ghosts of Society
- The Amazing Partnership
- The Channay Syndicate
- The Human Chase
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The Secret Service Omnibus 1932 (September): London, Hodder and Stoughton |
- Miss Brown of X.Y.O.
- The Wrath to Come
- Matorni's Vineyard
- The Great Impersonation
- Gabriel Samara
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Spies
and Intrigues: The Oppenheim Secret Service Omnibus
1936 (October): Boston, Little Brown 1936: New York, Halcyon House |
- The Wrath to Come
- The Great Impersonation
- Gabrial Samara, Peacemaker
- Mr. Billingham, the Marquis and Madelon [not included in the Halcyon House
edition]
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The Oppenheim Secret Service Omnibus Number One
1946 (May): Boston, Little Brown |
- Mysterious Mr. Sabin
- A Maker of History
- the Illustrious Prince