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Series
7 books in the catalogue

Book 1
By order of the President
William E. Butterworth III

Book 2
The hostage
William E. Butterworth III

Book 3
The Hunters
William E. Butterworth III

Book 4
The Shooters
William E. Butterworth III

Book 5
Black ops
William E. Butterworth III

Book 7
Covert warriors
William E. Butterworth III, William E. Butterworth IV

Book 8
Hazardous duty
William E. Butterworth III
Book data and covers from Open Library (openlibrary.org).