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Presidential agent series
1. By order of the president - GRIFFIN, W. E. B.
2. The hostage - GRIFFIN, W. E. B.
3. The hunters - GRIFFIN, W. E. B.
4. The shooters - GRIFFIN, W. E. B.
5. Black ops - GRIFFIN, W. E. B.
6. The outlaws - GRIFFIN, W. E. B.; BUTTERWORTH, WILLIAM E., IV
7. Covert warriors - GRIFFIN, W. E. B.; BUTTERWORTH, WILLIAM E., IV
8. Hazardous duty - GRIFFIN, W. E. B.; BUTTERWORTH, WILLIAM E., IV
9. Rogue asset - ANDREWS, BRIAN; GRIFFIN, W. E. B.